Can't access trunk port on MAX BR1 Pro 5G

Hello everyone,

I have recently purchased a MAX BR1 Pro 5G and am currently facing the problem that I do not have access to IP addresses on VLANs on a trunked LAN port.

I have 3 VLANs, in this case vid 1-3 each with its own /24 subnet.

I can’t get access via an Aruba 2930m with the exact same vlans tagged on the port, or via a Realtek Ethernet adapter that supports 802.1Q.
I see ARP requests on this VLAN with Wireshark, but don’t get any ARP response from the MAX.

//Edit: even with static arp entry no connection is possible. Trunk between two Peplinks works fine tho.

No firewall is configured so far.

I am grateful for any help.

Cheers,
Maurice