The error message again: `
'An error occurred when trying to authenticate to the FCM servers. Make sure the credential used to authenticate this SDK has the proper permissions. See https://firebase.google.com/docs/admin/setup
This error message is about enabling Cloud Messaging and Firebase Cloud Messaging - they are two different services, and both have to be enabled.
Note that yours might not be these two if you are working on a project that requires different services. However, the issue is about enabling required Firebase service.
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for further assistance!
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Thanks so much! It helped a lot