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While logged out
https://help.steampowered.com/en/wizard/HelpWithLogin
I deleted or lost my Steam Guard Mobile Authenticator > enter the user name > I no longer have access to this phone number
That should give you some alternative ways to remove the authenticator. If you need Proof of Ownership attach the info used and explain the situation in your ticket.
The only proove that I can show is some steam guard codes I received in my mail before the mobile app was been used.
So I bought it there with paypal. So I think it will be ok with the screens I can give them from this payment.
Sorry for the confusion.