Hi Prashant - Welcome to the Atlassian Community!
If those don't pan out with Jack's recommendation, you should open a support ticket with Atlassian. Your email might have gotten blacklisted during the sign up process.
If it is a specific address only that does not receive the invitation then my guess would be it is being blocked on the incoming email side. Some spam filter for example. Check the junk folder. It would be interesting to create an automation role as a test that sends an email to that address.
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