Hope this would help you:
Right click on the game and go to the app settings, try to repair depending on your pc is going to take a while,
if that wont work restore the app , that is going to clear all updates, restart your pc and go to C:/programfiles/windowsapp/mutablebackup and delete the folder that's inside (if there's no folder just check that pso2 is 11gb with right click app configuration)
then download pso2 tweaker here: https://na.arks-layer.com/
READ THIS IS IMPORTANT: https://na.arks-layer.com/tweaker-install.html
when you finish dont close the tweaker click on troubleshooting and let it check all the files it may take a while depending on your pc.
then is ready to play close the tweaker and launch it via microsoft store or direct access
Cya in game and Gl