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If your certification's expiry date was March 11th, it will have expired at midnight UTC on March 10th i.e., you needed to have renewed before March 10th and it was not possible to renew from March 11th onwards. Note: There is no benefit in waiting until the final days to renewal as the 12 months is added to the expiry date not the date you passed the renewal assessment.
The renewal period is open for 180 days before your expiry date. The renewal window cannot be extended or reopened.
https://learn.microsoft.com/en-us/credentials/certifications/renew-your-microsoft-certification-faq
My certification expired. What happens now? If your certification expires, you must earn the certification again by passing the required exam(s).