Push Notification: "Invalid grant: account not found" after restoring Firebase project

[Jessica Dao]

Hello,

Yesterday I accidentally deleted my production Firebase project (via GCP, I thought it was something else, I didn't know Firebase projects also showed in GCP).

Today I stored my project. But after that I was NOT able to send anymore Push Notification. I would get this error 

errorInfo: {

    code: 'app/invalid-credential',

    message: '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: invalid_grant (Invalid grant: account not found)". There are two likely causes: (1) your server time is not properly synced or (2) your certificate key file has been revoked.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.'

  },

  codePrefix: 'app'

After some digging, I noticed my "firebase admin service account" is disabled inside IAM of GCP. I tried to enabled it many times but it kept showing "Service account error" (attached photo). I was wondering if there is a way to fix this since this is currently affecting my users.

I tried another approached by creating another user-key access via the GCP but then I got the "third-party-auth-error"

  errorInfo: {

    code: 'messaging/third-party-auth-error',

    message: 'Auth error from APNS or Web Push Service'

  },

Please help me out.

Thank you

Jessica