3830813 - Application login page intermittently displays blank screen after upgrade when access token expires — SAP Commerce Cloud, composable storefront

• Following a recent upgrade, the application login page intermittently displays a blank screen for some users.
• The issue occurs randomly and prevents users from accessing the application.
• Refreshing the browser does not resolve the problem; clearing browser cache/cookies temporarily restores access.
• The issue reoccurs multiple times per day and was not observed prior to the upgrade.
• The issue appears to be related to cookies rather than static cache.
• Browser console shows multiple 401 Unauthorized requests.
• Server-side traces show InvalidBearerTokenException with message: “An error occurred while attempting to decode the Jwt: Expired JWT”.
• Unauthorized response format observed as:
• { "error_code": "invalid_token", "error_description": "An error occurred while attempting to decode the Jwt: Expired JWT" }
• After correcting the entry point configuration, the response format becomes:
• { "errors": [ { "message": "An error occurred while attempting to decode the Jwt: Expired JWT", "type": "InvalidBearerTokenError" } ] }

• SAP Commerce Cloud, composable storefront
• SAP Commerce Cloud Spartacus

blank login page, blank screen, 401 Unauthorized, expired jwt, InvalidBearerTokenException, token refresh, oauth2, occ, enrichingauthenticationentrypoint, oauth2authenticationentrypoint, response format change, commerce 2211, jdk 21, composable storefront, spartacus , KBA , CEC-SPA , SAP Commerce Cloud Spartacus , Problem