@Leungkwan2426 Check your router bottom sticker for the correct router model - details. You wrote about AX50 which is not mesh capable device. Is there a chance that you hae AX55 which is indeed...

@Merhh In your case you have to put the RE700X in AP mode - details.

@Dd1982 You can't do that because AX72 Pro doesn't support LAG (link aggregation) - details.

@Leungkwan2426 AX50 is not a mesh capable and that's the reason you're not seeing it via BE550 - details.

@JULIANODCO85 If it's about the mesh setup you can do the following: Set C7 (OneMesh capable) as a main router and AX73 (Easymesh capable) as a satellite router connecting them by the WPS method....

@xotoy Both Archer AX73 and Archer AXE75 support Easymesh so they both should do the job.