Certain devices connect to Wi-Fi but can't access the internet

[u/user43222]

Today I randomly started experiencing Wi-Fi issues with certain devices where they can access the Wi-Fi channel but can't access the internet.

I have a Virgin Media Hub 4 that's in 'modem' mode and a TP Link Archer AX72 that's in 'router' mode (connected via ethernet cable from TP Link WAN port to VM Hub LAN port 1).

Everything has been working fine for years, but around midday today all of the corporate devices in our house randomly stopped working (mainly Dell/HP laptops). They connect to the Wi-Fi but have 'no internet'.

I factory reset both routers, and when the VM Hub is set to router mode, all of the devices can connect to the internet and work fine. But whenever I set the VM Hub to modem mode and the TP Link router to router mode, the corporate laptops connect to Wi-Fi but can't seem to access the internet. All other non-corporate devices in our house work fine, it's just the laptops that seem to fail. I believe they're 2018-2022 models.

So far I've:

• Power cycled and factory reset both routers
• 'Forgot' the networks on the devices, reconnected, restarted etc
• When 'diagnosing' on Windows, it mentioned something about the 'DHCP server' not connecting or something along the lines. So I manually added/reserved IP addresses for the laptops within the IP Pool. It worked for 2 of the laptops momentarily, but when I restarted the devices it stopped working again.
• Tried changing the 'security' type from (don't recall the labels exactly) WPA/WPA2-Personal to WPA3-Personal but it didn't seem to make a difference.
• Tried both 2.4ghz and 5ghz channels but no luck
• Reset 'network adaptor' on devices

I'm no tech wiz, so at a bit of a loss as to what to do now. Currently using my VM Hub in router mode, but the range/speeds are quite bad so would like to switch back to the TP Link router as the main ASAP.

The corporate laptops don't have access to cmd so I can't release/renew/flushdns (seen a few posts where people said this helped) or run any scripts myself.

If anyone has any ideas on what to do that'd be great. Any other info that might help for context, let me know.

[u/aznguy2020]

I would get a replacement virgin media hub as the modem mode isnt working