Few possibilities here
- Check if downloaded apk is valid or corrupted. Should be around 48mb (Can try to redownload from other links)
- Device rom is blocking sideloading. Workaround refer
Platinmods ADB/Shizuku Installer App | Android Sideload Restriction Bypass
on emulator you dont need it, you can use adb on your PC to install the apk don't appears to be healthy How to install it in emulator like vgaphone/virtual master
platinmods.com
