That's why we initially thought the the Office 365 Personal (Īccount) was interfering but by removing the live account made no difference. The fact that it redirects me, even when I just login is not correct. Gives me "401 - Unauthorized: Access id denied." error. Tells me the account is already signed in > click on it again > When I log into > type in username >Ĭlick on Outlook > Redirects me to the login page again > And yes tried connecting it from different networks and different internet providers no difference. Yes, there is no unsupported characters in the UserPrincipleName or Password. And I'm baffled that MS Support can't sort this out for me.Īny help or advice would be really helpful This has been going on for two weeks now. I even enabled MFA (Multi Factor Authentication) thinking it might solve the issue but it still gives me the error "401 - Unauthorized: Access is denied due to invalid credentials " when I try to access Outlook Online. Normally I can check IIS in a local Exchange environmentīut unfortunately I don't have access to the backbone. This tells me something is wrong with IIS or related permissions to the specific website (owa). So to me it's basically a problem with this specific users access to Outlook Web Access (owa) website.
Reset the users password multiple times etc. What I tried with Microsoft: Use Incognito mode, different browsers, different computers, removed the Office 365 Business license, re-add the business license, we removed the users Office 365 Personal account (deleted - as we thought it might interfere), This is brand new 8 mailboxes.Īll other mailboxes are fine and working 100%. Please note that this is not a hybrid Exchange setup / migration from on-premise Exchange. Outlook Online gives me the following message: "401 - Unauthorized: Access is denied due to invalid credentials." Out of the 8 mailboxes, I have trouble accessing Outlook with one mail account. Updated all DNS - CNAME, MX, A & SRV records as per Office 365 requirements (As I have done this a million times). We recently registered a new domain and created 8 user/e-mail accounts. I logged a few tickets with Microsoft and unfortunately they are not able to solve my issue. I'm coming here because I'm desperate to sort this issue out.