Password reset by email gives “Phone number isn’t registered yet”?

Has anyone seen this error before?

I forgot my TikTok password and chose to reset it using my iCloud email. The email recovery works and I get all the way to the screen where I enter a new password.

The password meets every requirement, but TikTok then says “Phone number isn’t registered yet” and won’t let me continue.

I never chose phone recovery — I’m resetting it by email.
Has anyone figured out how to get past this?

Screenshot attached.