I have an old "Apps for Domains" account and used an email address from it to sign up for Nest years ago. When everyone's home security cams were getting hacked due to password re-use Google tried to force everyone to use a gmail account for auth. It sounded like a good idea. Every time I'd open the app it'd spam me with a notification asking me to use Google auth instead of a username and password. I'd try, but every time I'd get a cryptic error back. Turns out they don't support Apps/GSuite/Workspace accounts at all. That didn't stop them from spamming me for months, however.
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I have an old "Apps for Domains" account and used an email address from it to sign up for Nest years ago. When everyone's home security cams were getting hacked due to password re-use Google tried to force everyone to use a gmail account for auth. It sounded like a good idea. Every time I'd open the app it'd spam me with a notification asking me to use Google auth instead of a username and password. I'd try, but every time I'd get a cryptic error back. Turns out they don't support Apps/GSuite/Workspace accounts at all. That didn't stop them from spamming me for months, however.