Camera problem when exporting to "Windows 64 Packaging"

Hello everyone, (I’m French, so if my English sucks, it’s because I use Google Translate) I have a big camera problem: basically I create a camera that follows 4 characters (a bit like Smash bros). In the game editor, it works very well! no problem ! but when I export it to “Packaging” >> “Windows64” the camera is FPS view, as if the camera is inside the character. While yet, in my GameMode, I did integrate the “SetViewTargetWithBlend”. All is well set. If anyone has a solution pls! >>This name camera is “BP Camera Guadeloupe” >>This name Game Mode is “Game Mode Commencer” (“Commencer” = “Begin” in french)