no changes was made on the MS and the MX.
MX have the default trunkt konfiguration for all vlans and nativ vlan is 1, the MS uplink Port have the same default trunk konfiguration.
The MS send a DHCP Discovery on 4 diffrent vlans and get a DHCP offer on all 4 vlans. The managment vlan is the default vlan 1.
The MS is now 7 day offline and can't get a IP-Adresse.
But we have another MS with the same port configuration and here ist all ok.