Push notifications don't work for Facebook Lite

GmsGcmRegisterSvc
onHandleIntent: Intent { act=com.google.android.c2dm.intent.REGISTER cmp=com.google.android.gms/org.microg.gms.gcm.PushRegisterService (has extras) }

GmsGcmRegisterSvc
register[req]: Intent { act=com.google.android.c2dm.intent.REGISTER cmp=com.google.android.gms/org.microg.gms.gcm.PushRegisterService (has extras) } extras=Bundle[{subtype=622912139302, sender=622912139302, X-subtype=622912139302, app_ver=161408057, app=PendingIntent{85ecaf7: android.os.BinderProxy@43ddd64}, kid=|ID|1|, osv=28, sig=fZHeJOJdPs8NktAD-0tsuQr2icBlgtNqtgVFZtIJEHBHQ_V6KCmK_MZIFI9sS1jhdoSj7N-2_U5y1ZtdVJkV9yIT_-h8swsSOk7XY9zB0dfUBcLTf-blJrKnOF2e05q0e7Mq-trI5V07PkVmIVhnpeIdOa9HkPLDt2bo2cp02VIQRFfFwA5rjiBCIFjq-6h8-ydtI_eXKSTnNyHtgguX0LDiqqFEKshx8B3Ek6eLXUsCbli9JRoQS6vJSHfwzZd3PUYfA-GRQzZBxm2Ynu1W0Hak26YnRX6a0FGapm44kaC0uWpAqweNkVw0UZEPBnjWDRieeGK9X1WTdDX5qcfSjw, cliv=fiid-11020000, gmsv=177852801, pub2=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAzRLTLL6yLBkhc5KpVTuYwHkIzmXM9FYMCwWy2tJjFaKRgtsKCvoyc-B0ZI-OlBFkPjyJF4F6MW_DWRcrKA36uQCUdUzr5Ms11nBF1LqsKR0T4QMT3MfiARPzNGNh1x2pgzg0-Yk_kocyuh2dOUtEp2Q7iaI-Wus3xpX6VBr6-ha71TQAAIPh5uaFdFdXt7vtoFsyqje2-MaFs2YCAxd_RZpOy1Sfyr-22OpG3tAqMSXlIO3L7HQcHW12qYZNpHT4Wm1_U5XTHs-ZbXZs72JN8VVCCHkCU31net4obo2t3QcGtyj7eHrj7bJYXNHCpwqMQ9wQtziVQDSpDV7h87UNZQIDAQAB, X-kid=|ID|1|, appid=e6wCHt3PS68, scope=FCM, google.messenger=android.os.Messenger@723ebcd, gmp_app_id=1:622912139302:android:472dc569f8dd50f9, android.support.content.wakelockid=358, app_ver_name=153.0.0.10.129}]

GmsHttpFormClient
-- Request --
X-GOOG.USER_AID=4124529691026361702&device=4124529691026361702&app=com.facebook.lite&cert=8a3c4b262d721acd49a4bf97d5213199c86fa2b9&app_ver=161408057&app_ver_name=153.0.0.10.129&gmsv=17785000&scope=*&osv=28&sender=622912139302&subtype=622912139302

Start with the GmsGcmRegisterSvc and GmsHttpFormClient log entries, then trace the PushRegisterService registration flow for Facebook Lite's FCM request. Reproduce the failed registration using the details in the report and determine whether registration completes and notifications are delivered; the issue is done when Facebook Lite receives push notifications.