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You have to renew each associate and expert level certification each year
There is no limit on the number of active certifications that you can hold
https://learn.microsoft.com/en-us/credentials/certifications/renew-your-microsoft-certification-faq
How many times can I retake the assessment? There is no limit to renewal assessment retakes. Just be sure to pass before your certification expires. If you don’t pass, you can try again immediately. After the second try, you'll need to wait at least 24 hours between future attempts.