I have a GL-AX1800-909-5G with Firmware: 4.2.1 release4.
My MacBook Pro (Retina, 13-inch, Early 2015) running Mac OS Monterey version 12.4 will not connect to the internet when the VPN is active. It will connect if I disable the VPN.
My wife’s laptop connects fine with the VPN active, as well as our phones and iPads.
I’m wondering if you inadvertently have a VPN policy set to block client devices from using the VPN & if so, the 'net in general (aka ‘Kill-Switch’ functionality).
(Another place to check is that devices aren’t toggled to be blocked in general (GL GUI → Clients → $device → Block WAN))