Cannot get icloud mail or BT mail on ipad7.1

Hello randers4 or anyone else who can help!

randers 4 - I hope you can help me as I have been advised by Demo that you are very knowledgeable about iCloud.

I have had a similar problem to mhurley16 although with more prior issues too. My iCloud email and BT Yahoo email accounts stopped working on my ipad when at home about 2 weeks ago but when I visited my local Apple Store and used friends/family wi fi, they both work fine and my BT email is also fine on my PC. I have spent many, many hours trying to fix this problem as I use my ipad to check emails every day and therefore find this whole issue very frustrating to say the least! I have deleted and then added both email accounts to no avail - still fine on other wi fis - and today I noticed that the password in my iCloud account is shorter than the new one I set up a few weeks ago. I therefore deleted and then added again my iCloud email using my new password and all details were verified successfully, but when I checked my iCloud details again, it is showing the shorter one again. I also logged in to My Apple ID account and used my new password successfully so cannot understand why my iCloud password is not using the same one as I thought they were automatically linked via My Apple ID. I am now left wondering why these passwords are not the same, and whether this issue is the root cause of the problem of "cannot get mail" on my ipad? If you can shed some light on these - or if anyone else reading this can help - I would be very grateful. Thank you!