@gapps.microsoft.com would be at least better than a random unverifiable @gmail.com address. Google Workspace (is that what we're calling it this week?) lets you use subdomains right?
All you'd need to actually work would be email, so some MX records on a subdomain. Is it ideal? No. Is it better than all of your users having no way to verify that a Chrome extension is actually you? Infinitely better.
vs. months of emails and meetings for something that more or less achieves the same result
ever wondered why these large companies end up running things on random domains?
this is why