This is the exact problem I have. I signed up using Google for my work account and then lost access.
Even though I was able to get my old work account temporarily reinstated, when I add my new email address it forces me to verify via SMS. I then get the message “This phone number is already linked to the maximum number of accounts.”
I reached out to customer service using the Billing prompts because it’s the only place the bot actually allows you to enter text.
The only solution that I can think of is adding another cellphone number to my plan. I don’t want to sign up for a paid account if I won’t be able to access it.