[de.eventim.mobile.app.Android] cannot load content

Affected app
Name: EVENTIM
Package id: de.eventim.mobile.app.Android

Describe the bug
The app starts and shows a loading indicator. After some time, it fails with an error message which states that it cannot load the content and the network connection shall be checked.

To Reproduce
Start the app.

Expected behavior
App starts and allows to access tickets.

Screenshots
N/A

System
Android Version: 15
Custom ROM: LineageOS 22.2

microG
microG Core version: 0.3.9.250932
microG Self-Check results:
not ticked

• GSF
• search accounts (nothing happens)
• notifications (nothing happens)
• SMS (nothing happens)
• on top of other apps
• work profile (not editable)

Additional context

• Installed via F-Droid.
• No root/Magisk.
• I saw this post to recompile the proxy. Is it required?
• Unclear status reported for /e/OS.
• Error seems to be similar to eBay app.

Start by reproducing the EVENTIM failure on Android 15 with LineageOS 22.2, microG Core 0.3.9.250932, and the listed self-check state. Compare the behavior with the linked eBay issue 1450; done means identifying the compatibility cause and restoring access to tickets.