Legacy FCM response now forbidden

Legacy FCM doesn’t work anymore since the weekend.

My devices send push notifications via Legacy FCM via I didn’t change anything, but since the weekend I get the error code “HTTP/1.1 403 Forbidden”. Does anybody else have this problem since a few days?
Changed google something?

I tried my keys with It still works. So I think google changed something in the firebase console.

Is it possible that there is a secured access needed (https) and http is not supported anymore.


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