Hello Johnny,
1 - I need to check that but it's weekend so not possible to contact IT admins however, I dont have any issue with OWA - OMA - Outlook under Windows and Android.
2- I tried to put the email address or domain\email but no go. Same issue.
3 - yes other users have the same issue. ( We're a 10,00-50,000 employee company )
4- This issue doesn't occur with pure Microsoft account however it says license not found which is OK as I have not purchased any for my personal account
Best Regards,
Karim