I think someone is on my account

[dvanneman]

I think someone is on my account because I have another person using my account with a different name. HELP!  I have had this account for almost 5 years and I go to 2 meeting every day.  I'm overwhelmed by Zoom's technical terms.  I called up Zoom and Zoom instructs me to do 2 numbers from my account, and I did that.  They said they could NOT find my account!  Please, can someone help me?  I have the latest update for Zoom although I have an old MAC OS computor.

[LK_EXN]

I don't fully get all the details and what you meant by "I have another person using my account with a different name."... But anyway - if you are an account owner, then just simply change you password to something new.

If you have an account with paid license (Pro or higher), then you will have access to security settings:
https://support.zoom.com/hc/en/article?id=zm_kb&sysparm_article=KB0064901 

I'd advise checking if "One-Time Passcode Authentication" is Enabled.

You can also click your profile picture when logged in from browser, go to "Where you're logged in" section and press Sign me out of all sessions: