Hi,
I came here as last place to understand if this is a bug or I missed some configuration.
I have 2 SSD one Ubuntu (Gnome) and one Manjaro (KDE), from Manjaro with Dolphin I can't open my home on Ubuntu, same username and password on both.
When I try get ported back to the Manjaro Home.
So I installed Nautilus and it work, at this point I don't know if is a bug in Dolphin.
Thanks for any suggestion.

You may need to ensure both systems use the same user id for your user in both systems. A simple way to check if that is set up correctly is to run "ls -l /home" from the command-line in both systems. They should both say that your home directory is owned by your user, but if the user ids are different then it will show that it is owned by the user id from the other system.

To correct that, use the distro's user management tools (possibly just command-line) to change the user id to match.

Thanks for you anwer,
but I "fixed" changing the visualization of path, enabling full path fix the problem, with the UID of the disk visible on the path all is working fine.
Thanks