@Haru0819 

1. Configure your Windows computer to request IP address dynamically.

2. Using Deco app, assign (reserve) static IP address to that computer, follow this FAQ: https://www.tp-link.com/en/support/faq/1795/

As a result, you'll see Windows computer in Deco app and Windows computer will always have same IP address.

  @Alexandre. 

thank you for your reply.

i'm sorry if my English is hard to understand. i'm not a native speaker. and i may have explained my issue unclearly before.

Actually, i have already tried the steps you suggested.

i set my PC to use DHCP, and i assigned a fixed IP address to it on the Deco app. my pc connects correctly with the assigned IP address.

however, the main issue is that my PC doesn't appear in the online client list of the Deco app; even though it is connected properly.

Because of that, i can't 

• see which Deco unit my PC is connected to.

• check traffic data between my PC and Deco.

• confirm whether device-specific wifi settings or QoS rules working for my PC

when i enabled the randomized MAC address option on my PC, it is showed up in the online client list. but randomized MAC address breaks the QoS and wifi settings tied to the fixed MAC address.

So my question is: how can i make my pc show up in the online client list.

could this issue be caused by a specific settings on Deco or Windows? or is it a known bug? ( i already tried rebooting) 

any help or suggestions would be really appreciated.

Chat-GPT helped me to write this.

thank you. 

  @David-TP 

thank you for your support.

after i updated Deco units, my windows computer appears in the list of online clients again.

the problem has been solved.

thanks to everyone who replied.