I found a solution: While LAN Management-Access works with TAG 10 set in the managed switch for the TL-WA1801 (as described above), the TL-WA1201 must be set to untagged in the managed switch.

@Tomi99 Is your router/Orange-box vlan-capable? I don't think so. VLAN1 work, because it's untagged traffic (simply said: no VLAN). The other VLAN are tagged, for this you need such kind of router...

Hi @Joseph-TP, Thank you for your help. My managed switch is a Zyxel GS1900-16 (Managed LAN of AP is VLAN10, Port of TL-WA1201 has PVID 10, Accept Type "Tagged & Untagged", and VLAN 10 is tagged)....

I use both Access-Points (AP) TLWA1201 and TL WA1801. Both AP are in multi-SSID mode and connected via LAN to a managed switch. I want to set the LAN connection of the AP to VLAN10. TLWA1801: No...