There is no password to reset. Find your case below.
Sign in with the account you work from; Emily never sees its password.
Look in spam or quarantine first. The link works once and expires in 20 minutes; some corporate mail scanners open links before you do, so if it says it was already used, request another.
Your identity on Emily is the work account you signed in with. If that address is gone (you left a company, it was closed), there are two ways back:
Open Emily on any other device and use Sign out everywhere under Settings → Account. Sessions also end on their own after 30 days, or 14 days without use.