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I don’t know my password

Use Forgot password. Each emailed link works once and expires, so request a fresh one rather than re-opening an older message.

My invitation never arrived, or it has expired

Check junk mail first. Only a department admin can issue a new one — ask whoever set up your department to re-send it, which gives you a fresh link.

I’m not sure which email I was invited at

A work address and a personal address are two different accounts. Your department admin can see the address your invitation went to.