Just as a comparison to help with troubleshooting, this is the inxi -Fazy network output for my Beelink SER5, which uses the same wifi adapter as the SER8:
Network:
Device-1: Realtek RTL8111/8168/8211/8411 PCI Express Gigabit Ethernet
driver: r8169 v: kernel pcie: gen: 1 speed: 2.5 GT/s lanes: 1 port: f000
bus-ID: 01:00.0 chip-ID: 10ec:8168 class-ID: 0200
IF: enp1s0 state: up speed: 100 Mbps duplex: full mac: <filter>
Device-2: Intel Wi-Fi 6 AX200 driver: iwlwifi v: kernel pcie: gen: 2
speed: 5 GT/s lanes: 1 bus-ID: 02:00.0 chip-ID: 8086:2723 class-ID: 0280
IF: wlo1 state: up mac: <filter>
Info: services: NetworkManager, systemd-timesyncd, wpa_supplicant
One thing I have found, and this is a fairly recent occurrence (the past few months or so), is that my SER5’s wifi connects with successful authentication to the router, but doesn’t send or receive traffic. Switching the wifi off & back on via the Network icon in the system tray, allowing the wifi to autoconnect again to the router, often fixes that problem. Not an issue for me though, as I use Ethernet 99.9% of the time.
Edit: I see that, while I was typing this, the issue has been resolved by doing a full power-off. A full power-off can force a firmware reload, especially after a system update. Switching it off and back on seems to be as applicable today as it was when I got my first PC in 2001.