How does this work after 7 days and is it possible to transfer ownership (can prove) when there is no one on the other side of the email address to verify/accept the transfer?
If you have waited the 7 days, you can contact Google.
have you attempted to contact GMB Support for assistance
If you would like to try and contact Google Business you can follow the steps below to receive a call or chat (during normal business hours)
Google Business Help >Need More Help (top right corner)>Ownership or Access to my business>Other Problem>
Yes, you can manage both business listings in one Google account.
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