[Question] Signature mismatch when installing Google Play Store instead of microG Companion on MatePad 12x (HarmonyOS 4.3)

[LuxuriousLeisure]

I am trying to set up microG on a Huawei MatePad 12x running HarmonyOS 4.3.
I installed:

• microG GmsCore 0.3.12.250932 (com.google.android.gms-250932024-hw.apk)
• microG Services Framework Proxy 0.1.0 (GsfProxy.apk)

When I attempt to install Google Play Store APK (to replace microG Companion), the system shows an error: signature mismatch.

How do I solve this problem? Or is this method not available at present?🙏