microg / microg/GmsCore

[26.2514.3 de.telekom.android.customercenter] cannot login to MeinMagenta

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Dominant language
Java
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Description

Affected app
Name: MeinMagenta
Package id: Version 26.2514.3
de.telekom.android.customercenter

Describe the bug
I fail to login with a cryptic error message "%1$@" see screenshot

To Reproduce
Steps to reproduce the behavior:

  1. Open the app
  2. Click on: "Mit dem Telekom Login anmelden" (use telekom data to log in
  3. Enter account data (I assume it does not matter what's entered here)
  4. See error

Expected behavior
With a phone that has GPS installed I can login with my data

Screenshots
See error message

System
Android Version: 15
Custom ROM: 22.2-20250811-NIGHTLY-l01k

microG
microG Core version: 0.9.3.250932
microG Self-Check results: All ticked but "permission to interact with work profile
Google account set up and working in some apps

Additional context

Image

Contributor guide

No contributing guide indexed for this repository

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

The report names no source file, test, or code entry point. First reproduce the Telekom login flow on Android 15 with the listed custom ROM and microG 0.9.3.250932, then trace the authentication failure represented by the "%1$@" message. Done means the MeinMagenta login succeeds with the reported setup and the cryptic error no longer appears.

Written by the indexing model from the issue text.

Assessment

Tech stack
android, java
Domain
authentication, mobile
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
30/100

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