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FirebaseError: Permission 'iam.serviceAccounts.signBlob' denied
GCPコンソール > IAM でサービスアカウントPROJECT_ID@appspot.gserviceaccount.com
にサービスアカウント トークン作成者の権限を付与する
FirebaseError: Permission 'iam.serviceAccounts.signBlob' denied on resource (or it may not exist).; Please refer to https://firebase.google.com/docs/auth/admin/create-custom-tokens for more details on how to use and troubleshoot this feature.
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