Got a yellow warning message on the top of the app:
"We couldn't access this account: Zohomail. You might need to update your password or give the account permission to sync to this device."
Windows 10 ClientI used "Application-Specific Passwords".
It has been detected on the "Device Sign-Ins" list, but still can't sync
I also tried to disable Multi-Factor Authentication, but still not working
For additional info, this is the default setting of the Win 10 Mail Client App that I use