Hi David,
i found a way to bypass this problem.
if you rename that dynamic vlan - status will be canged like a "non-dynamic" VLAN and i can add it to a port.
https://gtacknowledge.extremenetworks.com/articles/Q_A/MVRP-vlan-management/?l=en_US&fs=RelatedA...
* X440G2-12p-10G4.3 # conf vlan SYS_VLAN_1651 name Lab-MN-1
* X440G2-12p-10G4.5 # conf vlan 1651 add port 2
VLAN 1651 Lab-MN-1: Port 2 untagged has been auto-moved from VLAN "Lab-MN" to "Lab-MN-1".
* X440G2-12p-10G4.6 #
VLAN 1651: sh vlan Lab-MN-1
VLAN Interface with name Lab-MN-1 created by user
Admin State: Enabled Tagging: 802.1Q Tag 1651
...
Ports: 2. (Number of active ports=1)
Untag: 2
Tag: *12H
Flags: (*) Active, (!) Disabled, (g) Load Sharing port
(H) Dynamically added by MVRPPort 2 = Access / Port 12=Uplink
I ask if this will be expected behaviour or do i use a bug ??