Hi @ews2001
Thank you for sharing your issue on Microsoft Q&A.
I Understand you are encountering the error message: "Unable to save credentials; the maximum number of secrets has been reached." This occurs because a user cannot have more than 48 credentials configured across all password SSO apps they are directly assigned to.
To add more apps with password-based SSO for a user, consider assigning the app to a group that the user directly belongs to. By doing this, the credentials configured for the group will automatically be available to all its members.
Follow the document for additional information: https://learn.microsoft.com/en-us/entra/identity/enterprise-apps/troubleshoot-password-based-sso#i-cant-add-another-user-to-my-password-based-sso-app
As per your queries:
1.Upgrading your subscription will not increase the number of credentials that can be configured for a user. The limit is set by Microsoft and cannot be changed.
2.Yes, you can see in the admin center the number of secrets in use by going Applications>App registrations>Certificates & secrets.
Hope this helps. Do let us know if you have any further queries.
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Best Regards.
Harshitha Eligeti.