Mount the SMB share. Run the command
smbutil statshares -a
look for "SIGNING_ON TRUE", if "TRUE" run this command:
printf "[default]\nsigning_required=no\n" | sudo tee /etc/nsmb.conf >/dev/null
remount the smb share. run this command again:
smbutil statshares -a
"SIGNING_ON TRUE", should NOT be shown.