This is the Happy Wars Management team.
An issue with the Steam save data transfer has been found.
Toylink passwords which include “?” or “~” will cause the save data transfer to fail.
To all users affected by this, you can change your password by going to https://toylink.toylogic.com/pwdpx and changing your password here.
We apologize for any inconvenience caused, and hope to see you in Happy Wars again soon!
Save Data Transfer Password Issue