Some new permissions are protected by Android now, and cannot simply be granted. You can try several things that may or may not work, depending on your ROM:
- Extracting the MicroG APK from the zip and installing it as an user app update
- Installing MinMicroG as system instead of as a Magisk module
- Clean flashing, if all else fails
##### GCM/FCM push messaging
Go to microG settings > Google Cloud Messaging and check if the app is connected.