Email accounts on S21

[JuneBee]

Hi - please can someone assist- I am reasonably techy but by no means an expert with phones and computing. I was asked today to sign in again to main email account (btinternet), and despite putting in the correct password, it wasn't accepted. I have now managed to delete the account but cannot retrieve it, says it cannot be verified. How do I get it back on my phone - it's the main thing I use my phone for!! 

Thanks.

[-Robot-]

What email app you using anf are you able to verify that credential are correct through a browser?

[ecosse01]

As Robot has mentioned, try accessing BT INTERNET via your browser at: https://www.bt.com/help/email/need-help-logging-in-to-your-bt-email-

[JuneBee]

Thanks both, had already tried checking the BT website, for email, which let me in no problem.
Only just now, after leaving things alone for a few hours, I tried again and managed to add the account!! I know my password was correct each time, so that's all a bit bizarre.
Thanks for the advice and have a good evening.