"Site admin" implies Cloud. You'll need to either be able to read his email and issue a password reset email, or contact Cloud support over at https://support.atlassian.com
For Server installations, see https://confluence.atlassian.com/doc/restore-passwords-to-recover-admin-user-rights-158390.html
Hi my Community friends! For those who don't know me, I'm a product marketer on the Confluence Cloud team - nice to meet you! For those of you who do, you know that I've been all up in your Co...
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