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Credentials expire at the beginning of the date of expiry not the end. They expire at midnight UTC time zone. So you should have renewed on April 14th or much much earlier.
The renewal period is open for 180 days before your expiry date. The renewal window cannot be extended or reopened. There are no exceptions.
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).