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When going to check my webmail whether on: https://mail.office365.com or Outlook.com my username/password doesn't work with my custom domain, BUT it does work when I log into the admin panel and goto Outlook. Rather annoying. My custom domain is active.
I have checked your screenshot. I noticed that it was Outlook Live page. To troubleshoot the issue, I suggest typing mail.office365.com directly in the web browser. Alternatively, you can use the following link to log in Outlook Web App.https://login.microsoftonline.com/login.srf?wa=wsignin1.0&rpsnv=2&ct=1335325760&rver=6.1.6206.0&wp=MBI_KEY&wreply=https:%2F%2Foutlook.com%2Fowa%2F&id=260563&whr=office365.com&CBCXT=out
Can you log in Outlook Web App successfully?
Do you mean that you couldn’t use email@example.com to log on Outlook Web App via https://mail.office365.com/ or Outlook.com? However, you could log on Microsoft Online Portal and click Outlook to log in it.
Does any error appear when using firstname.lastname@example.org to log on Outlook Web App via https://mail.office365.com/?
If so, please capture a screenshot and post it in the forum for further research?
This is the screenshot of the message. My email is working, all my DNS entries are correct.
How are things going? Do you need any further assistance with this question?