To recreate, you can either create your own project (steps below) or clone this gitrepo: https://bitbucket.org/janne_rasanen/matchmakerwsa/src
Steps to recreate in Unity:
1. Create empty gameobject, add NetworkManager component
2. Create new prefab with NetworkIdentity component, name it player
3. Drag the player prefab to the NetworkManager as player prefab under Spawn Info
4. Add the script below as new component to the same gameobject (with name CreateMatch):
Creating a match through UNET Match maker on WSA causes AccessViolationException
Steps to recreate in Unity:
1. Create empty gameobject, add NetworkManager component
2. Create new prefab with NetworkIdentity component, name it player
3. Drag the player prefab to the NetworkManager as player prefab under Spawn Info
4. Add the script below as new component to the same gameobject (with name CreateMatch):