I'm trying to connect to an external VPN via Windows VPN (PPTP). This works fine if I use my hotspot from my mobile phone (bypassing the Archer BE800). Also works fine from other networks. But when trying to connect from home (where I have BE 800) it fails. Tried both with Workstation (Ethernet) with Windows 10 and with my laptop using the Wifi via BE800. 

Credentials phase seems fine quickly connecting and accepting them but then it loads for about 60 sec. and then error:

"The vpn connection between your computer and the vpn server could not be completed. The most common cause for this failure is that at least one Internet device between your computer and the VPN server is not configured to allow Generic Routing Encapsulation protocol packets. "

Error message on laptop Win11:The remote connection was not made because the attempted VPN tunnels failed....

Settings on the VPN is Allow Microsoft CHAP V2.

Enable  LCP connections.

There is no ISP device in between or before my computers and Archer BE800. SFP optical fiber directly into Archer BE800.

Workstation is Windows 10 Ethernet directly to router and laptop is Windows 11 using Wifi6.

Any idea what could be hindering the connection?