Thank you for reaching out to the community forum!
I understand that you would like to know how to manage certificates for federated single sign-on. If a certificate is about to expire, you can renew it by Follow the instructions in from the below document. Also, you can customize the expiration date for your federation certificate and roll it over to a new certificate.
Reference: Manage certificates for federated single sign-on
Hope this helps. Do let us know if you any further queries.
Thanks,
Akhilesh.
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