VPN not working on Windows 10 1903

As you had fresh installed Windows on your old PC, then this might be an issue related to drivers. Also the **VPN not working issue** is related to drivers (WAN Miniports). This driver is used for several types of network connection like WAN Miniport (IP), WAN Miniport(IPv6) & WAN Miniport (PPTP) used for VPN connections.

So, try reinstalling it, also confirm the third party antivirus and virus are not conflicting with it. Despite this if you are using the business network connection than contact the network administrator as they may help

Source: https://answers.microsoft.com/en-us/windows/forum/all/windows-10-pro-1903-l2tpipsec-psk-vpn-not-working/5ba0f315-9c01-462b-bba9-b2a05578a81b

the easyest way i found to get vpn workinng with 1903 is to use rasphone just type rasphone after clicking the windows button it all becomes clear

As stated in earlier posts, this issue IS caused by Windows' failure to display the credentials dialog prompt when using the system tray to initiate a VPN connection. If initiated via System Settings or using the Rasdial command all VPNs connect successfully. It would seem by saving your credentials via Rasdial or System Settings that the credentials prompt would no longer be required. Unfortunately this is not the case. In order to use the System Tray to initiate a VPN connection successfully you will need to make sure the "Remember my credentials" box is checked for each VPN adapter setup in the Network Connections control panel. Once the credentials are saved using the System Settings connection method, connecting via the System Tray will be possible for future connections. This is definitely not a fix but a workaround. Hopefully Microsoft will resolve this issue soon.

In summary:

System Settings -> VPN -> VPN connection -> Advanced Options -> Edit

     add Username and Password to the connection profile -> check box for "Remember my sign-in info" -> SAVE

Next do the following

Control Panel -> Network and Sharing Center -> Change adapter settings

     right click desired VPN adapter -> Properties -> Options tab -> check box for "Remember my             credentials" -> OK

I hope this helps clear up the confusion as to how to workaround this frustrating issue.

Мне помогло отключение сетевой службы Xbox Live.

It obviously has nothing to do with XBox Live. Especially since non of my installs have anything related to XBox in them. All of the XBox components have been stripped out.