Same here on EGS . From what i remembered I ALT+F4-ed out of the game and then had to "End Task" the KF2 process that was ghosting around the background processes for ~2 minutes resulting in EGL not letting me boot the game up again.
After it boot I was Player0, with everything (perk rank, inventory, daily/weekly quests) being reset due to the game/EGL not correctly fetching my account info.
Now, how I got it SOLVED:
- Deleted the KillingFloor2 folder from Documents > My Games
- Used the Verify feature of EGL, on the game
- Booted the title and chose to use the Cloud Saves (since there was nothing on Local)
I wholly doubt that the Verify part did anything or that this will work for you or others on Epic or Steam.