Help! My friend is trying to join with his preferred username but can't

My good friend Ibrahim is trying to join, however, he didn’t activate his account in time and he can’t claim his username again. His username that he signed up with is @Ibrahim but now the system won’t let him pick that one, only @Ibrahim1. How can we fix this???

I sent him a new activation email

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After how long do activation emails expire? Because my friend is still in bed.