I'm being driven to despair by this. I've been trying for three days to set up an email account in Outlook on my Xiaomi Mi A2 Lite and I feel as if I'm banging my head against a wall.
First of all it refused my personal 123-Reg email, even though I know I'm using the right username and password.
Then I tried my old Tiascali email address, which in previous releases of Thunderbird I could only set up using POP3. These days, POP isn't even an option, so with this in mind I set up a new
talktalk.net IMAP account, which Thunderbird almost set up in seconds, except that I had to manually alter one of the port numbers it set automatically.
The trouble with Outlook is that port numbers appear nowhere in the setup process, but in any case, even with this new IMAP account, using the same details as I put into Thunderbird, it keeps telling me my username or password is wrong.