When setting Azure AD app registration for using OAUTH 2 authentication, you need to create a client secret.
A client secret has an expiration date that now (from the Azure Portal) can be set to 24 months as maximum:
When setting Azure AD app registration for using OAUTH 2 authentication, you need to create a client secret.
A client secret has an expiration date that now (from the Azure Portal) can be set to 24 months as maximum: