groupmod -m ?

[nalkema]

deric-accounts: v2.0.0
deric-gpasswd: v0.3.2

I have on RHEL 7 & 8 systems the following error :

Notice: /Stage[main]/Accounts/Accounts::User[account1]/User[account1]/ensure: created (corrective)
Error: Could not set members on group[staff]: Execution of '/usr/sbin/groupmod -m account1 staff' returned 2: /usr/sbin/groupmod: invalid option -- 'm'
Usage: groupmod [options] GROUP

Options:
  -g, --gid GID                 change the group ID to GID
  -h, --help                    display this help message and exit
  -n, --new-name NEW_GROUP      change the name to NEW_GROUP
  -o, --non-unique              allow to use a duplicate (non-unique) GID
  -p, --password PASSWORD       change the password to this (encrypted)
                                PASSWORD
  -R, --root CHROOT_DIR         directory to chroot into
  -P, --prefix PREFIX_DIR       prefix directory where are located the /etc/* files
Error: /Stage[main]/Accounts/Accounts::Group[staff]/Group[staff]/ensure: change from 'absent' to 'present' failed: Could not set members on group[staff]: Execution of '/usr/sbin/groupmod -m account1 staff' returned 2: /usr/sbin/groupmod: invalid option -- 'm'

No idea where the m option is coming from.