If any of the Spring Cloud applications require authentication or authorization, ensure they're configured to access the identity provider:
If the identity provider is Azure Active Directory, no changes should be necessary.
If the identity provider is an on-premises Active Directory forest, consider implementing a hybrid identity solution with Azure Active Directory. For guidance, see the Hybrid identity documentation.
If the identity provider is another on-premises solution, such as PingFederate, consult the Custom installation of Azure AD Connect topic to configure federation with Azure Active Directory. Alternatively, consider using Spring Security to use your identity provider through OAuth2/OpenID Connect or SAML.
https://learn.microsoft.com/en-us/azure/developer/java/migration/migrate-spring-cloud-to-azure-spring-apps?toc=%2Fazure%2Fspring-apps%2Ftoc.json&bc=%2Fazure%2Fspring-apps%2Fbreadcrumb%2Ftoc.json&pivots=sc-standard-tier#migrate-and-enable-the-identity-provider