Created attachment 17316 [details]
smb.conf from Kubuntu 22.04
reference to first submit to KDE folks:
Again the problem is for Kubuntu 22.04 not Kubuntu 20.04 where everything is working fine.
included: smb.conf from sender and receiver which is identical.
Anyway for the moment Kubuntu 22.04 is a bit buggy as expected. Many of Access denied to smb://whatever from Dolphin!
as requested via mail to you yesterday you should provide the smb.conf of both server and client and a network caputure and detailled samba/libsmbclient version information. A qualified bug report must also provide a compact but good bug desription and not just a link to a different bug tracker. If other bug trackers go offline we'll miss the information. From the very rudimentary smb.conf you attached it look like it is probably also better to first check your problem on the samba mailing to see if this is not a configuration issue.