IIRC Azure certs are valid for 2 years when you first get them. Then you have to renew every year after that. The cert says 2021 so that means you're beyond the 2 years and it has expired.
But this is mostly mute as nobody has access to your cert unless you share it. Go to your Microsoft Learn profile. Click your profile in the top right corner and then go to Credentials. Select the
Certificates` tab. It shows all your certificates and whether they are valid or not. If you click the certificate details you'll get an updated cert UI that shows when it expires and a link that can be shared with others to confirm your credentials.