Iphone Wireless Email Problems

Update my pc to windows 11 and lost ability to see emails.  So went through the new instructions fir VM/O2 ID,   secondary email and eventually figured out how to create an email APP password.....  what a run around but eventually got email working on PC.....

Problem is,  I have now lost ability to get emails on my iPhone which did work beforehand....   Trued deleting account on iphone and reinstalling but could never get connection.....  eventually tried turning wireless off and hey presto, now working......BUT AS SOON AS HE TURN WIRELESS BACK ON, IT STOPS AGAIN, SAYING NTLWORLD IMAP SERVER NIT RESPONDING.

Surely, my settings are all OK, as it works when not connected to wireless,  eaving me to believe maybe the route was blocking that port.    But if that was the case, why is PC working OK.....

I am at a loss of what to try next.........any advice.....