Apple-ID Authorization via federated microsoft account fails

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
45/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Active
Tech stack
macos, swift
Domain
authentication, desktop

Research direction

Start by reproducing the failure through the Xcodes.app login button and the provided federated URL in Safari. Trace the browser handoff and SAML message handling, then verify that federated Microsoft login reaches the Apple-ID flow without the base64-encoding error.

Written by the indexing model from the issue text.

Description

bug

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

Image Image

Version

  • OS: macOS 27.0
  • Xcodes: 4.1.1 (41)
Dominant language
Swift
Stars
8.6k
Forks
387
Avg merge
6d 7h
Merged PRs (30d)
3

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  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

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