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Recently I've noticed on my Google Cloud Platform a 25%-30% erroneous traffic coming from CreateInstallation method of Firebase Installations API (error code 403) and 1% from GenerateAuthToken (code 400). Is that a normal situation? If not then what could possibly be a problem?

I really do appreciate any information regarding the issue, thanks.

UPDATE: I'm not sure if this is related but I was able to reduce Firebase Firestore error rate by a slight margin (entry Total Errors in Firebase Console/Cloud Firestore/Rules/Monitor rules) by double checking of my Security Rules and adding conditional check request.auth != null before request.auth.uid == uid. Of course the main problem is still valid.

function isAuthorized(uid) { return request.auth != null && request.auth.uid == uid; }
Eric
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  • Same problem here but we haven't figured out a solution. Did you? – Fran Sevillano Oct 19 '20 at 17:32
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    Haven't found a solution or even explanation for this phenomenon – Eric Jan 31 '21 at 09:58
  • Have you guys tried to investigate the issue as outlined in [this SO answer](https://stackoverflow.com/a/58496014/2402281)? EDIT: Sorry, just saw that you already commented on that answer. :/ – tafaust Feb 07 '21 at 08:39

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