Preserve URL fragment in App Service with built-in Authentication

Question

Hello,

I have setup App Service with built-in Authentication using Microsoft as identity provider following the guides in https://learn.microsoft.com/en-us/azure/app-service/scenario-secure-app-authentication-app-service?tabs=workforce-configuration.

Authentication itself is working as expected.

I need to preserve URI fragment after the login flow is finished. I have added WEBSITE_AUTH_PRESERVE_URL_FRAGMENT=true into application settings as documented in https://learn.microsoft.com/en-us/azure/app-service/configure-authentication-customize-sign-in-out#preserve-url-fragments, but the URI fragment is still stripped.

Do I need to configure something else?