i cant send emails by iphone

i cant send emails by iphone

hi,

i cant send emails by iphone and i get this message - "the user name or the password for .... is incorrect. (i added a photo).

I tried everything 1. I changed my password 2. I checked the e-mail settings on your PC and iPhone 3. You may perhaps that the Two Factor Authentication bother ? I think it does not enable in my case . In any case I have no idea then how to undo it ( I saw someone wrote that you click on the link at the bottom of the page to disable it but I have not found such a link . This option now appears to me as "Two Factor Authentication is currently not configured for your account" Please help me with that problem , it is very disturbing business function .. thanks