This is a common problem. Many businesses have a Google My Business listing that’s already been verified by either an employee, an agency or by the owner themselves (but they just forgot which email address they used). Now that employee or agency is gone, and the business owner doesn’t know how to get access to their GMB listing.
Since the Google My Business listing is “owned” by the person who verified the listing, it’s important for the owner to get back control of their listing.
The first thing you want to do is to confirm that the business is listed on Google My Business:
Try a different email address
If you’re like most people, you probably have more than one email address. You might have verified your business using one of your other email addresses. Try signing out and then sign back in with one of your other Google accounts.
You will see any listings that have been verified with this Google account. If you still don’t see the business listing in any of the owner’s Google accounts, then you will need to contact the current listing owner.
Request access from the current listing owner
Google allows you to contact the current listing owner directly through Google My Business so you can request access to own or manage the business listing.
To request access from the current listing owner:
(Note: You might see a dialog that shows part of the email address that was used to verify the listing. The business owner might recognize that email address snippet. If the owner recognizes the email address, sign into that account to access the business listing.)