Looks like it's time to export all the stuff I have there and delete the account.
If they want it for 2FA, then you'll need a real number.
edit - when in and deleted mine, they didn't ask for any 2FA.
I'm sure the fake phone service that can receive messages could work just fine for one time use, and then just use an auth app (which are all terrible btw). The entire 2FA thing stinks extra hard nowadays.
Sometimes those temp number services work, but a lot of the 2FA services ban them as quick as they see them. Just my experience with them, anyway.