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I confirm the error is due to incompatibility. Server version 7 requires client libraries (Android or iOS) version 4.

A full tutorial for the new MPN client APIs is available on our blog here: ...

Hello again,

any news on this issue?

This changes the scenario completely. If you are experiencing the problem only on some devices, it may be due to how the device token is obtained. Let me explain.

As per Google’s suggested...

This kind of error can not related to the database. It is a backend service error. Dropping the tables, if performed when the Server is down, causes no harm (beside deleting devices and...

Hello,

do you have any news on this issue?
Best regards,

Gianluca

Hello,

did you recently migrate your project from GCM to Firebase Cloud Messaging? If this is the case, the migration has probably changed your sender ID.

Since Server version 6.1 still uses...