SMB Share:access denied when using hostname, ip is working

Client: Windows 10, domainmember. domainname: dom
OMV System: Hostname: omv01, ip 172.16.10.15, domain: dom

I can see all my smb shares, when i type in \\omv01
I can access all smb shares where guest access is configured via \\omv01\guestshare
I have a share "test". Owner users.
When i try to access \\omv01\test i'm promted for a password. Correct. I type in the credentials for "user1" and get an no access message.
When i try \\172.16.10.15\test and type in the credentials for user1, it is working.
omv01 has an dns entry (forward and ptr). Any ideas?

Solved. There were multiple connections, because i mapped the guestshare with a group policy as netwokdrive.