How do I request to allow a specific domain in teams

Hi @Jeff Hampton, 

Thank you for posting your question in the Microsoft Q&A forum. 

Based on the details you shared, I understand you want to allow a specific external domain in Microsoft Teams and you are trying to locate the External access setting. I truly appreciate the time you’ve already spent and reaching out so I can get this working smoothly. 

Microsoft has introduced a unified External collaboration area in some tenants, therefore the path can appear as External collaboration then External access instead of Users then External access. In addition, only a Teams admin or a Global admin can change these settings, and federation works only when both organizations allow each other’s domains. 

Below are some workable options that might be the most appropriate for your current situation: 

1/ Open the External access settings page 

• Try the navigation that matches your tenant: 
  • Teams admin center > External collaboration > External access (new unified experience), or 
  • Teams admin center > Users > External access (classic placement).  
• You can also open the page directly: External access - Microsoft Teams admin center. If you don’t have sufficient admin rights, this link may show an access message; in that case, ask a Teams or Global admin to follow the next steps.  

• Reference: Unified external collab settings management (preview) - Microsoft Teams | Microsoft Learn 

2/ Allow only your approved domain 

• In External access, choose the option to Allow only specific external domains and add the partner’s domain to the allow list, then Save. 
• Remind your partner to add your domain on their side as well, because federation is two‑way. 
• After saving, wait for policy propagation and then test by starting a 1:1 chat from Teams with a user at the allowed domain.  
• Reference: IT Admins - Manage external meetings and chat with people and organizations using Microsoft identit… 

3/ Optional controls for complex scenarios 

• If you need to limit external access to specific users or groups (for pilots or sensitive roles), create custom External access policies per user/group via PowerShell and assign them accordingly. 
• If your security team centrally manages block lists, you can enable the option to manage Teams blocked domains via the Microsoft Defender Tenant Allow/Block List and administer blocks from the Defender portal. 
• Reference: Block domains and addresses in Microsoft Teams using the Tenant Allow/Block List - Microsoft Defend… 

I hope this response has helped address your question and clarify the behavior you're experiencing. Please feel free to reply if you have any further questions, I would be happy to assist further.  

Thank you for your patience and your understanding. I look forward to continuing the conversation.  

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To allow a specific domain in Microsoft Teams, you need to access the Teams admin center. Here are the steps to do that:

1. Sign in to the Teams Admin Center at https://admin.teams.microsoft.com.
2. In the left navigation pane, expand Users.
3. Select External access.
4. Under Choose which domains your users have access to, select Allow only specific external domains.
5. Click on Allow domains.
6. In the Domain box, type the domain that you want to allow and then select Done.
7. If you want to allow another domain, select Add a domain and repeat the process.

This will enable users in your organization to communicate with the specified external domain(s).