I have been using this router for several years with no issues.  I have 2pc's (win11), 1 .printer and 1 TV connected via wired ethernet and 1 TV and 1 laptop on wireless. I recently purchased a HP laptop (win11) and tried to connect to my wireless network with no luck ( used the same pin as other devices)   returned it to the seller, thinking it was defective.

I then purchased a Dell laptop (win11 home) and had the same problem.  I tried the laptop on a Dell network repair depot wireless network and it connected without problem.  I took the laptop home and setup my cell phone(connected to my wifi network) as a mobile hotspot tethered to the Dell laptop via bluetooth, and connected flawlessly.  I have tried forgetting the wifi networks (2.4G and 5G), rebooting the router. ( all my devices reconnected, but could not connect the laptop, either wifi or wired lan)  I have downloaded a new laptop bios and network drivers to no avail. Both 2.4 and 5G networks are displayed (also Guest network) but cannot be connected.  My old laptop does not support win11 and is getting long in the tooth, but connects to wifi.  Any thoughts would be appreciated.