They all look like they are mounted to me.
The log shows:
Feb 15 09:28:47 UNRAID2 nmbd[5426]: [2021/02/15 09:28:47.368021, 0] ../../source3/nmbd/nmbd_become_lmb.c:397(become_local_master_stage2)
Feb 15 09:28:47 UNRAID2 nmbd[5426]: *****
Feb 15 09:28:47 UNRAID2 nmbd[5426]:
Feb 15 09:28:47 UNRAID2 nmbd[5426]: Samba name server UNRAID2 is now a local master browser for workgroup WORKGROUP on subnet 192.168.122.1
Feb 15 09:28:47 UNRAID2 nmbd[5426]:
Feb 15 09:28:47 UNRAID2 nmbd[5426]: *****
Feb 15 09:28:47 UNRAID2 nmbd[5426]: [2021/02/15 09:28:47.368139, 0] ../../source3/nmbd/nmbd_become_lmb.c:397(become_local_master_stage2)
Feb 15 09:28:47 UNRAID2 nmbd[5426]: *****
Feb 15 09:28:47 UNRAID2 nmbd[5426]:
Feb 15 09:28:47 UNRAID2 nmbd[5426]: Samba name server UNRAID2 is now a local master browser for workgroup WORKGROUP on subnet 172.18.0.1
Feb 15 09:28:47 UNRAID2 nmbd[5426]:
Feb 15 09:28:47 UNRAID2 nmbd[5426]: *****
Feb 15 09:28:47 UNRAID2 nmbd[5426]: [2021/02/15 09:28:47.368226, 0] ../../source3/nmbd/nmbd_become_lmb.c:397(become_local_master_stage2)
Feb 15 09:28:47 UNRAID2 nmbd[5426]: *****
Feb 15 09:28:47 UNRAID2 nmbd[5426]:
Feb 15 09:28:47 UNRAID2 nmbd[5426]: Samba name server UNRAID2 is now a local master browser for workgroup WORKGROUP on subnet 172.17.0.1
Feb 15 09:28:47 UNRAID2 nmbd[5426]:
Feb 15 09:28:47 UNRAID2 nmbd[5426]: *****
\
and
Feb 16 15:37:09 UNRAID2 kernel: CIFS: VFS: BAD_NETWORK_NAME: \\UNRAID1\tdarr-cache
Feb 16 15:37:09 UNRAID2 kernel: CIFS: VFS: cifs_mount failed w/return code = -2
Feb 16 15:37:09 UNRAID2 unassigned.devices: SMB default protocol mount failed: mount error(2): No such file or directory Refer to the mount.cifs(8) manual page (e.g. man mount.cifs) and kernel log messages
I think UD is having trouble looking up the server name. Try using IP addresses instead.