Webdav login doesn’t require authentication

I have updated to Nexcloud 19 (Ubuntu server).

I have a netbook with KDE Neon 20.04 and i have configured in Dolphin access to Webdav of my Nextcloud. Now that i have updated, every time that i access to my folder webdav in dolphin, this show message next:

"You are about to log into the site XXXXXX.com with the username XXXXXXX, but this website does not require authentication. It is possible that it is an attempted deception.

Is XXXXXX.com the site you want to visit?"

I have to do click on “Yes” for can access. If i close dolphin and i go back to access, the message comes out again.

How can i fix it? Thanks.