I can't receive firebase and google developer invite email

I am going to use my friend's firebase project and android app. My friend sent invite email to my Gmail account from his firebase project and google developer account. But there is no any invite email from his account and so I can't accept this invitation. From his google developer account and firebase project, it says invite is sent already.

google developer account invite

It is same as a case of Firebase project. Why I can't get invite email from my friend? Furthermore I could get invite from other's account before. But from some days before I can't get the invite. Please help me anyone knows about this issue.

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