Apple-ID Authorization via federated microsoft account fails

[markusfassbender-lb]

Describe the bug
I tried to login with my company account via federated microsoft login in browser to my Apple-ID.

The error message is:

AADSTS750056: SAML message was not properly base64-encoded.

To Reproduce

• Open Xcodes.app
• Click on login button top right
• Enter email and password
• Alert with federated url to open is provided
• Click on "Open browser" button
• Safari browser opens with error

Expected behavior
Login via Safari browser works.

Screenshots

Version

• OS: macOS 27.0
• Xcodes: 4.1.1 (41)