No duplicated IPv6 interface addresses allowed on USG
I'm using several VLANs in my network all on underlying LAN1 interface. I try to give each VLAN interface the IPv6 address fe80::1 but the Web GUI does not allow to configure this address. Why? When I'm using CLI it's possible but I can this only do for one interface. When I try to configure the same address to another VLAN interface I get the error that this address is already in use. How can this be? For my understanding, same link-local addresses can be used on different network segments. I want to have each interface in all VLANs using the same simple gateway address. Is this a bug or am I wrong here?
Thank you for your help already.