"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
Most of us don’t need much convincing that stakeholder management is important. It just makes sense that keeping everyone in-the-know on projects and assigning clearly defined roles is key to having ...
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