I cannot get past the 2FA step, so I asked the Owner to remove me from the organization, but the 2FA is still in place and I cannot rejoin it.

In Sentry, when the 2FA is set, it is bound to the account and not the organization - that's why it did not reset or didn't get deleted when you were removed from the organization. This is because, with one account, you can access more organizations.

Please contact support, we'll be more than happy to help out.