samba-tool group addmembers error - string_to_sid: SID <groupname> is not in a valid format

I've found reference online on this error, but dated about samba 4.1...

Domain member samba 4.22.4-18.el9_7.x86_64, joined to an MS AD domain.

I've created groups via 'samba-tool group add', and group exist:

 [adminmgaiarin@ppfs1 ~]$ wbinfo -g | grep fvg_sir
 fvg_sir
 [adminmgaiarin@ppfs1 ~]$ getent group fvg_sir
 fvg_sir:x:504233:
 [adminmgaiarin@ppfs1 ~]$ wbinfo -n fvg_sir
 S-1-5-21-3195041156-2418829160-2956828833-4233 SID_ALIAS (4)

but:

 [adminmgaiarin@ppfs1 ~]$ samba-tool group addmembers fvg_sir marco.gaiarin --URL=ldap://ppdc1.fvg.ad.lnf.it -U adminmgaiarin -d 3
 lpcfg_load: refreshing parameters from /etc/samba/smb.conf
 Tried to load /etc/samba/smb.conf.%M but variable substitution in filename, ignoring file.
 resolve_lmhosts: Attempting lmhosts lookup for name ppdc1.fvg.ad.lnf.it<0x20>
 GENSEC backend 'gssapi_spnego' registered
 [...]
 GENSEC backend 'http_negotiate' registered
 Password for [LNF_FVG\adminmgaiarin]:
 string_to_sid: SID fvg_sir is not in a valid format
 ERROR: Failed to add members ['marco.gaiarin'] to group "fvg_sir" - Unable to find group "fvg_sir"
   File "/usr/lib64/python3.9/site-packages/samba/netcmd/group.py", line 486, in run
     samdb.add_remove_group_members(groupname, groupmembers,
   File "/usr/lib64/python3.9/site-packages/samba/samdb.py", line 467, in add_remove_group_members
     raise Exception('Unable to find group "%s"' % group)

Why?! Thanks.

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