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I have various IMAP accounts which all work fine both from Outlook on Windows and from MailDroid, Thunderbird, Samsung Email, Windows 10 Mail, etc.

One particular email address gives a login error every time on Outlook for Android, both via autodetect and with manual input, despite my entering exactly the same values as on Outlook for Windows etc. (servers, user names, passwords, SSL/TLS port numbers).

I tested the setup against the Microsoft IMAP tester here https://testconnectivity.microsoft.com/tests/O365Imap/input and it passed. In particular there are no material SSL certificate issues.

The account works fine with Outlook for Android on a brand new Android installation (BlueStacks) but not on my 'phone or tablet.

I have also tried (against my better judgment) using the non-SSL ports (which the email server supports) - same login error experienced.

(edited to remove superfluous/confusing material)

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The problem here turned out to be the specific email address involved (autodetect was working as well as it could given some absent DNS entries; and anyway, as I now realise, autodetect/autodiscover means something different to every email client, and autodiscover specifically is really just an Exchange thing anyway).

I got suspicious once I had tried another email address in the same domain and it worked perfectly.

I had an old Hotmail account set up on the 'phone and tablet for various things (Windows Phone Companion, OneDrive, etc.) This Microsoft account had at one stage included an alias of the offending email address. I had got rid of this alias right at the beginning of this episode, but clearly the 'phone still thought it was there, and in particular Android Outlook was confused by it. Once I had tried on a brand new Android instance (via BlueStacks) and it had worked perfectly, I realised the situation, removed the Hotmail account from the 'phone, and Eureka.

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