Using New Outlook on Windows for professional communication and productivity
Sadly still not working here.
Exactly the same problem with extra accounts not adding, despite wortking fine all together in the current version (and individually in the web app).
Seemed to work last time I tried it (although I still happily switched back, as I prefer the older version) this time I can't add my "business" accounts at all, The personal one works ok, but not the other two.
Good reason not to change yet, anyway.