I had the same issue try this it worked for me :
- Connect to your IOI account on account.ioi.dk
- Delete the game account associated with the IOI account
- Log out of the IOI account
- Reconnect with your Playstation / Xbox account …
- Link your game account with the IOI account
- Launch Hitman 2 in your console and access to the main menu
- Go to Options> IOI account> refresh
- Refresh the page and the game account should show as linked
- Start the progress transfer process