I had to abandon my Google workspace account with my main email domain after they booted the free GSuite status (I migrated before they changed their mind unfortunately). Not only is that account gimped because it is a Google Workspace account (with little things all over that refuse to work with those style accounts at all) now it's even more gimped because it has no active subscription tied to it.

I can't downgrade it to a personal account without deleting the account and recreating it, but there's not even a guarantee that will work. Deleting the account will also mess up family photo albums and other items. Photo storage is full but I'm also unable to pay for storage without adding a subscription to the account. It's so risky to try and fix it that I just had to migrate to a new google account, re-purchase all my android apps, and just ignore that account forever.

A Google Workspace account does not work for Nest. I signed up for the free Google-email-but-with-your-domain thing more than a decade ago. A bit more recently but back when I was still a Google fanboy I bought a Nest thermostat and was astonished that my account could not be used for Nest.