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Please log in to the OWA through http://mail.office365.com/ to check whether you are able to access it or not.
If you are still not able to access OWA, please capture a screenshot of the error message and post it here.
Do you have any updates on this issue? Please let me know if you need further assistance.
1 out of 1 people found this post helpful.
Same issue here. Error occurs sporadic. I tried different url`s.
I tested the link: http://mail.office365.com on my side, it works now. If not able on your side, it’s recommended that you login to OWA(outlook web app) via portal.microsoftonline.com by using Internet Explorer. If you still encounter an error, please take a snapshot and we will help you to analyze the issue.