There is a new Bug affecting new Google My Business profiles, confirmed by Google.

What is happening? Google My Business users will receive an email advising the profile is visible to the public, but when you sign in to your Google My Business Account, it asks to enter verification code.
If you press on “Claim this business” on the live listing, it will advise the listing has been already claimed/verified:

Google recommends all users affected by this issue to contact Google My Business Support as the next step.
05 April 2021 – No further updates
You can check other Google My Business issues. Also, you can learn to improve your profile ranking with my Google My Business Optimization Training – GMB Empower.
Be remarkable!
Hope it helps.
Professor M
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