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IAM missing required permission

Dear Google Members,

I am trying to add some users. But I am not getting any '+'  sign to add users. I did some basic troubleshooting and came to know that I am missing some IAM permissions, which I don't know-how. Because the account which I am using is the parent account. And before that, I was able to create some users. But now it just disappeared. How do I get back my permissions?

Really appreciate yr help and support.

Thanks,  

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