ICloud IMAP dont work, other services are working

Mail
1

ICloud IMAP dont work, other services are working.

Currently im evaluating EMClient for my personal needs.

I downloaded the current client and installed it on my Windows OS.
Setup with the ApplicationKey generated in AppleID is working fine, meaning i can interact with my ICloud Calendar and the ICloud Contact.

If it comes to IMAP / ICloud Mail im receiving every time a AUTH issue. 
I check all available suggestions here at the forum but this didn’t help.

Please give me a hint to move forward on this.

2

I would first disable 2FA on your iCloud account and see if it works that way. At least then you will know if that is the problem.