Hi @Patrick Seidl ,
According to your description, I noticed that you can successfully add your custom domain account in other clients, but not in outlook 365 client. How did you configure it in outlook 2016 and what account type did you configure(POP/IMAP/Exchange)? If possible, please provide a screenshot of your successful configuration on the outlook 2016 client.
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For the outlook 365 client, is there any error pop-up when you add a custom domain account? And what's the version of your Outlook365? (File > Office Account > About Outlook). Please make sure you have upgraded your Outlook to the latest version. In addition, considering the impact of outlook 365 client corruption, it is recommended that you could try to fix the outlook program.
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Hi @Patrick Seidl ,
Welcome to our forum!
Please understand that I am doing research on your issue. Once the results are available, I will post them here. Thank you for your support and understanding!
Exact same problem except on the latest outlook 2016 I cannot even add the alias I set up. The alias gives the same errors as the main account and that you are getting.
If I rollback to a much earlier version of Outlook 2016 I can add the alias ok but not the original.
I can add the original account to outlook.com on iphone, Windows mail and iosmail so its definitely a problem introduced somewhere along the line to Outlook 2016/2019 in Office 365.
It’s now December and this issue still doesn’t appear to be fixed. I’m having the same issue after configuring a new domain, deleting my old one out of Outlook and now trying to add my new one.
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