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Android Device Group Not Receiving Messages

I didn't change anything in my app since several months but starting from 11th June I'm not able to receive any message sent by Firebase cloud messaging. It has been reported by several customers and I can confirm that it doesn't work anymore. No firmware change or anything at least on my phone. I used exactly the same code you find here. The message is sent, the callback onMessageSent in the FirebaseMessagingService is called correctly, but I'm not able to receive anything using the same account on another phone. Is there any big change I miss it? My configuration doesn't use a server so I can't check any log server side. Any tips?

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Answer

The official reply I've gotten from Firebase is: they simply don't support the no-server configuration anymore.

So after 30 emails with Firebase support here's the surprise: there's nothing wrong with my code/project, and the funny thing is that they don't know why and how it worked before! Unfortunately, they didn't advise anyone about this big change, so any app based on Android device groups without a server doesn't work anymore.

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source: stackoverflow.com
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