Can't add new Users | Invite(s) failing, not going anymore

I am trying to add new users to my existing project, we have cross checked the SPAM of the invitee and also tried 4-5 times over a span of 5 days to add this specific email id as in the screenshot. Please help we are on a Team paid Plan. I have already written two times to support and help. Anybody knows in the community how to fix this issue.

I am an admin user and have permissions to add users. I already added 2 users on a given project in our sentry system