Android Question FIREBASE TOKEN BLACKLIST

Where exactly do you see it?

Probably the user has opted out somehow.

I save the token to database ...I see in database string instead of token

The token IS a string. So please show us an example.

hookshy said:

http://danken.ro/pub/Blacklisted.bmp

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I never had such an Issue.
1. Did the user maybe hacked your app resp. the posting to your server to send "BLACKLISTED" instead of the Token?
2. Or maybe he is using a capture and saw the posting to your server.
He maybe then send another post to your server; overwriting the token in the DB with "BLACKLISTED"...

Scnenario 2 seems to be more real. That´s what i would try...

Away from that. I usually register the deviceid as a Topic and i send only to the Topics instead of a Token....

It seems that this is a known minor issue with our internal infrastructure where the device used for the Play Store review can be BLACKLISTED by GCM / FCM in some occasions. However, this should not affect your real users. We are looking beyond Firebase and working with Play Store team to avoid this inconvenience.

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Seems that these tokens come from some emulators