Please use the official method:

https://support.saber.games/hc/en-us/articles/11917823771665-World-War-Z-Aftermath-Cross-Saves

If that doesn't work you can still try the below.

Your save file from EGS is located here:

C:\Users\user profile\AppData\Local\Saber\WWZ\client\storage\slots

In the folder you're looking for the file: user_progression.dat



Open the Steam Cloud directory for WWZ:

C:\Program Files (x86)\Steam\userdata\your steam user ID\699130\remote

Delete the user_progression file located in the steam folder and replace with the EGS user_progression.dat. Rename the file from .dat to .cfg.



Done

Stop messaging me about the identical guide on the Steam Guides section. I wrote this guide and some other dudes copied it to farm profile points.