I found this issue when creating project (Firestore) in Rowy and i tried created new Key many times
Error setting Firestore/Storage rules: Credential implementation provided to initializeApp() via the "credential" property failed to fetch a valid Google OAuth2 access token with the following error: "Error fetching access token: invalidgrant (Invalid JWT Signature.)". There are two likely causes: (1) your server time is not properly synced or (2) your certificate key file has been revoked. To solve (1), re-sync the time on your server. To solve (2), make sure the key ID for your key file is still present at https://console.firebase.google.com/iam-admin/serviceaccounts/project. If not, generate a new key file at https://console.firebase.google.com/project//settings/serviceaccounts/adminsdk.