[OnePlus 12] baxtex:
Difficult to say exactly, but I hooked up adb logcat and saw this

03-08 13:26:05.375 3254 8386 E ScrollOptim [OplusPerfService]: isScrollOptimEnable: pkgName = ch.protonmail.android, output = Bundle[{pre_anim_enable=true, frame_insert_list=null, frame_insert_default_num=1, scroll_changed_enable_list=null}]
03-08 13:26:05.391 12140 9794 E FirebaseMessaging: Failed to get FIS auth token
03-08 13:26:05.391 12140 9794 E FirebaseMessaging: java.util.concurrent.ExecutionException: com.google.firebase.installations.FirebaseInstallationsException: Firebase Installations Service is unavailable. Please try again later.
03-08 13:26:05.391 12140 9794 E FirebaseMessaging: at com.google.android.gms.tasks.Tasks.zza(com.google.android.gms:play-services-tasks@@18.0.2:32)
03-08 13:26:05.391 12140 9794 E FirebaseMessaging: at com.google.android.gms.tasks.Tasks.await(com.google.android.gms:play-services-tasks@@18.0.2:9)
03-08 13:26:05.391 12140 9794 E FirebaseMessaging: at com.google.firebase.messaging.GmsRpc.setDefaultAttributesToBundle(GmsRpc.java:152)
03-08 13:26:05.391 12140 9794 E FirebaseMessaging: at com.google.firebase.messaging.GmsRpc.startRpc(GmsRpc.java:1)
03-08 13:26:05.391 12140 9794 E FirebaseMessaging: at com.google.firebase.messaging.FirebaseMessaging.blockingGetToken(FirebaseMessaging.java:130)
03-08 13:26:05.391 12140 9794 E FirebaseMessaging: at com.google.firebase.messaging.SyncTask.maybeRefreshToken(SyncTask.java:7)
03-08 13:26:05.391 12140 9794 E FirebaseMessaging: at com.google.firebase.messaging.SyncTask.run(SyncTask.java:106)
03-08 13:26:05.391 12140 9794 E FirebaseMessaging: at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:487)
03-08 13:26:05.391 12140 9794 E FirebaseMessaging: at java.util.concurrent.FutureTask.run(FutureTask.java:264)
03-08 13:26:05.391 12140 9794 E FirebaseMessaging: at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:307)
03-08 13:26:05.391 12140 9794 E FirebaseMessaging: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
03-08 13:26:05.391 12140 9794 E FirebaseMessaging: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:644)
03-08 13:26:05.391 12140 9794 E FirebaseMessaging: at com.google.android.gms.common.util.concurrent.zza.run(com.google.android.gms:play-services-basement@@18.1.0:7)
03-08 13:26:05.391 12140 9794 E FirebaseMessaging: at java.lang.Thread.run(Thread.java:1012)
03-08 13:26:05.391 12140 9794 E FirebaseMessaging: Caused by: com.google.firebase.installations.FirebaseInstallationsException: Firebase Installations Service is unavailable. Please try again later.
03-08 13:26:05.391 12140 9794 E FirebaseMessaging: at com.google.firebase.installations.FirebaseInstallations.registerFidWithServer(FirebaseInstallations.java:439)
03-08 13:26:05.391 12140 9794 E FirebaseMessaging: at com.google.firebase.installations.FirebaseInstallations$$ExternalSyntheticLambda2.run(R8$$SyntheticClass:80)
03-08 13:26:05.391 12140 9794 E FirebaseMessaging: at com.google.firebase.concurrent.SequentialExecutor$1.run(SequentialExecutor.java:3)
03-08 13:26:05.391 12140 9794 E FirebaseMessaging: at com.google.firebase.concurrent.SequentialExecutor$QueueWorker.workOnQueue(SequentialExecutor.java:77)
03-08 13:26:05.391 12140 9794 E FirebaseMessaging: at com.google.firebase.concurrent.SequentialExecutor$QueueWorker.run(SequentialExecutor.java:1)
03-08 13:26:05.391 12140 9794 E FirebaseMessaging: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
03-08 13:26:05.391 12140 9794 E FirebaseMessaging: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:644)
03-08 13:26:05.391 12140 9794 E FirebaseMessaging: at com.google.firebase.concurrent.CustomThreadFactory$$ExternalSyntheticLambda0.run(R8$$SyntheticClass:17)
03-08 13:26:05.391 12140 9794 E FirebaseMessaging: ... 1 more
03-08 13:26:05.398 1135 1135 E KeymasterUtils: IKMHal_sendCmd failed with rsp_header->status: -28