@Ceri2
When you signed up to 2FA you were given a recovery code so if you didn't make a note of it then check the email you were also sent.
To turn off 2FA sign in with the recovery code so at the login select "can't sign in with the code" link. You'll then be asked for the recovery code.
You can then set it up gain by supplyig your new phone number if needs be.
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