201 questions with Outlook | Web | Outlook on the web for business | Security tags

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1 answer

New Outlook Trust Persistence Failure — Enterprise & Government Risk

From: Network Engineer, Large Government Sector. Summary The New Outlook client introduces a regression in trust handling that materially disrupts enterprise and government operations. Specifically, the “Trust sender” action does not persist across…

Outlook | Web | Outlook on the web for business | Security
asked 2026-03-06T14:33:33.8+00:00
Tim 0 Reputation points
edited an answer 2026-03-06T18:14:02.21+00:00
Alexis-NG 13,535 Reputation points Microsoft External Staff Moderator
2 answers

Labeled and encrypted Mails in Shared Mailbox

Depending on the encryption configuration, it is not possible to open a message encrypted via a Sensitivity Label from a shared mailbox using Outlook New or Outlook on the Web. This results in an endless loop prompting the end user to open the message in…

Outlook | Web | Outlook on the web for business | Security
asked 2025-08-13T12:31:45.19+00:00
Zollt, Philipp 0 Reputation points
answered 2026-03-06T13:04:04.89+00:00
Gary Thonert 5 Reputation points
1 answer

No resolution on Service Request: S775 continues despite no block detected

Hello, I am posting this in reference to Service Request regarding ongoing Outlook.com / Hotmail deliverability problems from IP [Moderator note: Personal information removed]. We are consistently receiving the following SMTP response when sending to…

Outlook | Web | Outlook on the web for business | Security
asked 2026-03-03T11:16:06.21+00:00
Pablo Asenzo 0 Reputation points
edited an answer 2026-03-05T14:02:42.7633333+00:00
Tamara-Hu 11,970 Reputation points Microsoft External Staff Moderator
2 answers

550 5.7.708 – Access denied, traffic not accepted from this IP

Outbound mail blocked at tenant level” “IP address reputation issue” “Low reputation IP – new tenant scenario

Outlook | Web | Outlook on the web for business | Security
asked 2026-02-24T18:10:41.9133333+00:00
Kirsten Nelis 0 Reputation points
edited an answer 2026-02-24T19:16:41.09+00:00
Killian-N 9,380 Reputation points Microsoft External Staff Moderator
2 answers

Emergency: Locked out of Admin Account - MFA Loop (Authenticator app never configured)

Hi, I am seeking urgent assistance as I am completely locked out of my Microsoft 365 Business account and cannot access my email or the Admin Center. My business operations are currently at a standstill. The Issue: Account: Information deleted for…

Outlook | Web | Outlook on the web for business | Security
asked 2026-02-20T15:27:05.5333333+00:00
Maddy haseeb 0 Reputation points
answered 2026-02-20T15:51:48.1433333+00:00
Ryan-N 10,885 Reputation points Microsoft External Staff Moderator
2 answers

I can't log in using Microsoft Authentication.

About a month ago, my phone went missing, and I'm trying to log into my business account, but it's stuck on Microsoft Authentication. I can't do anything now. I really want to log in, but I'm blocked at this point. I have the password, but I can't…

Outlook | Web | Outlook on the web for business | Security
asked 2026-02-16T04:14:15.4266667+00:00
psbiogas 5 Reputation points
commented 2026-02-17T05:45:50.4+00:00
Jade Ng 9,370 Reputation points Microsoft External Staff Moderator
2 answers

My business outlook email has been hacked and I cannot change my password.

HELP! Error submitting password change. Business email has been hacked! Help, please.

Outlook | Web | Outlook on the web for business | Security
asked 2026-02-04T15:17:56.8333333+00:00
Rodney Stouffer 0 Reputation points
commented 2026-02-06T07:09:40.6366667+00:00
Vivian-HT 13,695 Reputation points Microsoft External Staff Moderator
1 answer

Microsoft won't let me change password

Microsoft won't let me change a password and I have been notified of suspicious logins.

Outlook | Web | Outlook on the web for business | Security
asked 2026-02-02T12:02:40.7533333+00:00
jcorbeil 0 Reputation points
commented 2026-02-05T15:39:54.89+00:00
jcorbeil 0 Reputation points
1 answer

my authenticator issue

dear team, my office email doesn't have an authenticator app login or anything yet it asks for a authenticator verification when i try to log in please help me with this matter ASAP

Outlook | Web | Outlook on the web for business | Security
asked 2026-01-23T06:58:40.5733333+00:00
Janaka Bamunuarachchi 0 Reputation points
commented 2026-01-26T13:24:42.8066667+00:00
Demi-N 13,255 Reputation points Microsoft External Staff Moderator
1 answer

Locate a sender

I need to know who sent me a harmful/threatening email. IP address is 52.103.10.54 Moved from: Community Center | Not monitored

Outlook | Web | Outlook on the web for business | Security
asked 2026-01-11T16:08:03.21+00:00
Jasmine Givens 0 Reputation points
edited the question 2026-01-12T10:27:45.9166667+00:00
Gérard Oomens 119.8K Reputation points Volunteer Moderator
2 answers

I'm traveling in Brazil and just want to advise all my Sign ins are still legitimate! I've gotten at least a hundred notices of "Suspicious Activity"

I tried to advise I was traveling overseas and the MS Postmaster wouldn't take my msg! Moved from: Microsoft Security | Microsoft Authenticator

Outlook | Web | Outlook on the web for business | Security
asked 2025-12-27T00:01:42.0966667+00:00
rick crawford 0 Reputation points
commented 2025-12-29T03:04:42.2766667+00:00
Viego An 8,990 Reputation points Microsoft External Staff Moderator
2 answers

I received an email We detected something unusual about a recent sign-in to the Microsoft account Moderator note: personal info removed

I don't know if this is authentic: I received an email from: Moderator note: personal info ******@accountprotection.microsoft.com We detected something unusual about a recent sign-in to the Microsoft account [Moderator note: personal info…

Outlook | Web | Outlook on the web for business | Security
asked 2025-12-27T00:11:22.27+00:00
Margaret Owen 0 Reputation points
commented 2025-12-28T23:33:20.19+00:00
Sophie N 12,500 Reputation points Microsoft External Staff Moderator
2 answers

Account Verification Required Before Subscribing to Services

Subject: Account Verification Required Before Subscribing to Services Message: Hello, I would like to subscribe to Microsoft services, but before completing the subscription, I need to verify my account. When I try to add my phone number for…

Outlook | Web | Outlook on the web for business | Security
asked 2025-12-18T05:40:28.4633333+00:00
alkhatwah stationary 0 Reputation points
commented 2025-12-19T05:48:10.64+00:00
Darren-Ng 8,425 Reputation points Microsoft External Staff Moderator
2 answers

how to call support?

how to contact Microsoft support directly to reset mfa? the number has auto answer system and it will screen me out. Moved from: Microsoft Teams | Microsoft Teams for business | Settings | Other

Outlook | Web | Outlook on the web for business | Security
asked 2025-12-14T22:13:52.1+00:00
ran 0 Reputation points
commented 2025-12-16T23:22:12.6533333+00:00
Sophie N 12,500 Reputation points Microsoft External Staff Moderator
3 answers

I have 100's of unfamiliar log in attempts, how can i mark them in bulk

I have received of emails today. And under recent activities, 100's are unfamiliar. How can i notify IN BULK that all are not me?

Outlook | Web | Outlook on the web for business | Security
asked 2025-12-09T22:28:20.1166667+00:00
Mark Pietras-Weed 0 Reputation points
edited a comment 2025-12-16T09:51:59.9533333+00:00
Jade Ng 9,370 Reputation points Microsoft External Staff Moderator
3 answers

How do I sign on to my main account [Moderator note: personal info removed] on the computer if the authenticator app won't connect to that account?

Our main business account isn't able to be accessed on the computer. We were somehow able to login to this account on outlook on IOS but we are not able to login on the computer. We have the authenticator app but it won't connect to that account. Then…

Outlook | Web | Outlook on the web for business | Security
asked 2025-12-11T17:18:33.19+00:00
JT Builders Operations 0 Reputation points
commented 2025-12-11T19:37:39.11+00:00
JT Builders Operations 0 Reputation points
1 answer

how to send a message from NATO unclassified to NATO secret?

It is impossible to send any outlook mail from NATO unclassified to NATO secret, even a single test mail. Why ?

Outlook | Web | Outlook on the web for business | Security
asked 2025-12-10T14:30:49.5566667+00:00
answered 2025-12-10T17:52:34.0566667+00:00
Vy Nguyen 9,470 Reputation points Microsoft External Staff Moderator
1 answer

Malware attachment in mail

We have receive every day multiple emails in my organisation that contain malware attachments. I do not want these emails to be delivered to end users or placed in quarantine. Instead, I want them to fail during processing so the system rejects them…

Outlook | Web | Outlook on the web for business | Security
asked 2025-12-07T19:50:39.8033333+00:00
Anil Diwan 0 Reputation points
commented 2025-12-08T22:19:01.5933333+00:00
Vy Nguyen 9,470 Reputation points Microsoft External Staff Moderator
2 answers One of the answers was accepted by the question author.

E-mail bloqueado

boa noite estou com meu principal mail bloqueado ja mandei inúmeros daqueles relátorios e não recebo nenhum mail da microsoft preciso de ajuda para conseguir desbloquear estou tendo um prejuízo imenso por conta de não conseguir acessar meu mail, como…

Outlook | Web | Outlook on the web for business | Security
asked 2025-07-29T10:45:18.58+00:00
Pamella Moraes 20 Reputation points
answered 2025-12-08T17:12:06.5533333+00:00
ANILTON Monteiro 0 Reputation points
1 answer

Worked Email Hacked Today

My work email was hacked today. I signed out of all devices, but I can't get my emails. I am getting spam emails, though. Moved from: Exchange Online

Outlook | Web | Outlook on the web for business | Security
asked 2025-12-01T22:00:27.3+00:00
Amy Rzepka 0 Reputation points
commented 2025-12-03T06:25:10.5966667+00:00
Darren-Ng 8,425 Reputation points Microsoft External Staff Moderator