Solved
My email is different in the Native app vs. the Web app.
Not sure how to change this, since the email in the Native app is one I no longer have access to.
I created a new acct using my Apple account, but it somehow linked both accounts (perhaps due to name and phone number?). Then I tried removing all Zoom apps and data and reinstalled. Same problem.
I'm running on a MacBook Pro with M2 Max, using Zoom 6.0.11 (35001)