Replaced old Wi-Fi Router with BE-6500 Wi-Fi 7. 

Wi-Fi works fine, but haven't connected my TP-Link Mesh Extender which was working on the old router. 

NAS (MYCLOUD-17MKBK) doesn't connect to network on WIN 11 PC (OFFICE-DESKTOP). 

WIN 10 (WindowsHP-Envy) does't connect to WIN 11 network. 

WIN 10 (WindowsHP-Envy) network connects to NAS and WIN 11. 

The WIN 10 (TV-MEDIA-PC) doesn't want to connect.

Google Streamer, Samsung BluRay, Pioneer AV Amplifier connects on LAN okay and work okay.  

WIN 11 PC (OFFICE-DESKTOP) shows network name as TP-Link_5CD4, while WIN 10 (WindowsHP-Envy) shows the old network name of GNOIXMJ 3, lastly WIN 10 (TV-MEDIA-PC) shows old network name of Network 3. 

All were working on the old Linksys AX3200 before it would no longer connect to the Internet.