Since I updated openssh from 8.6 to 8.8, WinSCP (last release) cannot authenticate.
I found that problem is on WinSCP because:
1) transfers using openssh-8.8 in Unix environment (tested with FreeBSD and Debian) worked fine, without problems.
2) communication (terminal emulating) using PuTTY, is ok
3) files transfers using Bitvise (importing the key used in WinSCP) worked well too.
Thus, I concluded that the problem is on the way (newly) by which WinSCP performs authentication process.
Please, anyone has noticed this problem too?
Thanks in advance for your attention