[de.dm.meindm.android] Every login attempt fails because of reCAPTCHA error

Affected app
Name: Mein dm
Package id: de.dm.meindm.android

Describe the bug
When trying to log into the app, it fails with a generic error message in a dialog. When checking logs, it reports the following:

08-12 23:06:16.121 10455 10455 E c       : Error while performing ReCaptcha action: com.google.android.recaptcha.RecaptchaException: Site key invalid (additionalDatadogAttributes = [team=ciam, dm-costcenter=1023313353, subsystem=Recaptcha, reason=RECAPTCHA_INVALID_SITEKEY])
08-12 23:06:16.125 10455 12794 E a       : Error during login: INVALID_SITEKEY (additionalDatadogAttributes = [team=ciam, dm-costcenter=1023313353, subsystem=Authentication, reason=RECAPTCHA_INVALID_SITEKEY])

To Reproduce
Steps to reproduce the behavior:

1. Go to "Jetzt anmelden" (login now)
2. Enter any email and password
3. Look at log

Expected behavior
ReCaptcha works

Screenshots
N/A

System
Android Version: 15
Custom ROM: LineageOS 22.2

microG
microG Core version: 0.3.9.250932
microG Self-Check results: All ticked, except "Permission to interact with work profile"

Additional context
This has been a problem ever since the app switched from a browser-based login to a native login view.

It seems like they are just using reCAPTCHA Enterprise SDK.

Both "Test ReCAPTCHA" and "Test ReCAPTCHA Enterpise" in microG's settings pass.

The issue names no repository file, test, or entry point. Start by reproducing the Mein dm native login flow on Android and tracing the reported reCAPTCHA Enterprise INVALID_SITEKEY error; compare it with the existing reCAPTCHA test results in microG settings. Done means the login attempt completes without the site-key error.