Thanks for writing in and sorry about any confusion!
Moz Local's validation system still uses Google Places, not GMB directly. Each location must be verified in Google Places (most easily checked on Google Maps) for Moz Local validate the NAP details.
GMB locations are not public-facing, they have details that only you as the owner/manager can see. So until any new changes are verified on Google Maps, they aren't detectable by Moz Local's validation system.
If you are still not sure why we're not picking up your location, feel free to reach out to [email protected] with your business name, address, phone number, as well as a link to your Google Maps or Facebook location, and we can help investigate!