GCM/FCM 200 message error (MismatchSenderId)
i use coutly on self-host
when i send push notification, message was sent but not deliver
i recive error:
GCM/FCM 200 message error(MismatchSenderId)
Most probably SDK competes for tokens with other GCM / Firebase SDK you have in your app. Please override the way our SDK or another SDK get a token so they would end up using the same token.
i use FCM
Someone can help me