Windows 10: How to configure my new TP-Link modem router to allow a VPN connection on Windows?

I have a router from the ISP that is working ok but with a very short range for WIFI. I bought a new TP-Link router. I did the quick setup nice and easy however when it attempts an Internet Connection Check it fails ALTHOUGH internet is working fine and WIFI is good. But still the connection check fails. Later I tried to work as I work from home and our platform has a built-in VPN and I was unable to receive my daily calls through this platform. I tried to connect my SurfShark VPN with my subscription just to test my theory and indeed VPN fails to connect. When go back to the old router, it wo

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Change TP Link Modem into Bridged Router

is that like a 100% certain thing ? I can see multiple options under networking that seems interesting :

Like interface grouping where it has something called VLAN and grouped WAN Interfaces

Also Advanced Routing & IPSec VPN , where can't maybe the TP Link Router connect to the VDSL router through LAN as a VPN connection ?

What am I to look for exactly to know if its possible or not ?

 

Change TP Link Modem into Bridged Router

This is the bad part about trying to use this device for wireless. “The router can also be configured in Ethernet mode, which disables the modem and re-purposes the fourth gigabit Ethernet port as a WAN connection. There's no option to disable routing entirely and use the device as a wireless access point, however; while you can simply leave the WAN connection disconnected for this, the router will fail to set its time and constantly fill the logs with DHCP errors.”

TP-Link Archer D9 AC1900 ADSL2+ Modem Router review | IT PRO

The OP would be best to get say an Asus RT-ac68u or DSL-68u. DSL-AC68U | Networking | ASUS Australia. The DSL-68U works with VDSL. This is a list of the other DSL models that Asus makes. xDSL Modem Routers | Networking | ASUS Australia

 

Change TP Link Modem into Bridged Router

This is just the opposite of what @nIGHTmAYOR wants to do. Bridge mode will activate the modem part only and deactivate the router part so a separate router can be connected to the modem of the TP Link unit. @nIGHTmAYOR wants to deactivate the modem part and use the TP Link unit as a router only.

Unfortunately @nIGHTmAYOR you can't do what you want to do with the TP Link Archer D9 modem because to work in router mode only it needs a WAN port and the WAN port of that unit is internal and permanently connected to the modem.