[com.playkot.farmington] Google Play Billing fails on Huawei + microG (reopened from #3640)

Hello,

I accidentally closed my previous issue (#3640) while adding the video attachment.

The issue is still reproducible.

Google Play Billing does not open on my Huawei MatePad 11.5s using microG.

The same Google account, the same Visa credit card, and the same Farmington game work correctly on:
- Realme Android phone
- LDPlayer emulator

Only Huawei + microG fails to open the Google Play purchase dialog.

The video evidence is available in the previous issue (#3640).

Thank you.

Review the previous issue #3640 and its video evidence, then reproduce the failure on a Huawei MatePad 11.5s with microG. Compare the billing flow with the working Realme Android phone and LDPlayer cases; done means the cause of the missing Google Play purchase dialog is identified and the issue is fixed or clearly documented.

Written by the indexing model from the issue text.