@Ttrax 

Hi, welcome to the community.

Were you trying to see on the connected lists of Deco X20, that it displayed all the online clients even though some of them are connected to Deco X90, not X20?

If yes, could you please send me a message of the MAC address of this Deco X20.

  @Ttrax 

Hi, Thank you very much for the message.

Could you please help me run a simple test:

1. Please add Deco X20 back to the Mesh network.

2. Check the connected clients under Deco X20 to see whether it would still show all the clients even though some of them are connected to X90.

--If yes, please save a picture of the connected client's list and send the APP log via Deco APP.

(Please also refer to this link to confirm these clients are connected to X90, instead of X20:How do I know which Deco my client is connected to?)

  @Ttrax 

Thank you very much for your message and I also received your email as well.

The case has been forwarded to the senior engineers for further assistance.

Please check the email for more suggestions.

Best regards.