When I referred to MX, that was the description "MX Uplink" of a trunk port on an MS. I applied a VLAN group with VLANs 3,4,10 in it. Then amended the VLAN group to remove VLAN 3 but the switchport still showed allowed VLANs of 3,4,10. If you then edit the switchport and reselect the exact same VLAN group for the allowed VLANs, then it updates the allowed VLANs just fine removing the 3.
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