Updated Edge and noticed that Office 365 is now free on Edge. Is this a new promo?
Looking into it further it's free with an existing or new Microsoft account and appears to also work with Chrome.
https://www.microsoft.com/en-us/microsoft-365/free-productivity-apps
Tip: If you get an error logging in with Microsoft @live.com email address just browse to accounts.microsoft.com, go to Your info, Edit account info, add an @outlook.com alias and use that to log into Office 365.
Looking into it further it's free with an existing or new Microsoft account and appears to also work with Chrome.
https://www.microsoft.com/en-us/microsoft-365/free-productivity-apps
Tip: If you get an error logging in with Microsoft @live.com email address just browse to accounts.microsoft.com, go to Your info, Edit account info, add an @outlook.com alias and use that to log into Office 365.