I am running the stable version of Edge based on Chromium, but when i try to set up the sync with a Office 365 Business Essentials License. But it hangs on setting up sync. I have another account that has a Microsoft 365 E5 License, on that account it does work. After a search on the internet i found out that u have to gave at least Azure AD P1 license on your account if you want to sync Edge with a business account.
Is this a bug of a feature? Because you can also sync with a Live account for free, so i cannot imagine why they would block this for a free Azure AD account included in the Office 365 Business Essentials?
with that said, I can use sync with Office 365 Business and business premium accounts. Business essentials has the least options. Though that's not a feature of Edge browser, that's an issue that needs to be fixed from Microsoft. I've seen other users complaining about it too