Wild Rift Unknown Error -100/-5 and Google Services on Huawei

Affected app
Name: LoL: Wild Rift
Package id: You can find the package id in the URL of the Play Store https://play.google.com/store/apps/details?id=com.riotgames.league.wildrift

Describe the bug
When I install Wild Rift and try to open it, I encounter "unknown error -100".

I went looking for information on how to fix error. I found #2302 , did everything with tips. Enabled Play Asset Delivery and Device Sync in microG settings. But there again "... Error -100".

If I disable Play Asset Delivery and Device sync, there is "Unknown error -5".

Neither VPN nor reinstallation helps in any combination. Is the problem in the microG, or how to solve it?

System
Device: Huawei MatePad 11,5S Papermatte
HarmonyOS: 4.2.0
Custom ROM: 8/256

microG
microG Core version: [0.3.6.244735-hw]
microG Self-Check results: All, but this:

But it unvailable to change. Just nothing.

Start by reproducing the failure on the Huawei MatePad 11,5S Papermatte running HarmonyOS 4.2.0 with microG Core 0.3.6.244735-hw. Check the Play Asset Delivery, Device Sync, and microG Self-Check states described in the issue, then compare behavior for errors -100 and -5. Done means the cause is isolated or the issue is documented with actionable evidence and a verified resolution path.