Try support:
https://learn.microsoft.com/en-us/credentials/support/help
https://learn.microsoft.com/en-us/credentials/certifications/renew-your-microsoft-certification-faq
Support request:
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Hello there,
I had PL-300 Certification renewal expired two days ago, unfortunately I did not received any notification or email about it's expiration and by accident I checked it today. I there any option to extend this renewal option? Probably certification was associated with my previous employer email address. I would really appreciate help on this.
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).