Post a log generated from playing the packaged build of your game. (Not the log you’ve posted, that one gets generated when you’re building… but the other one that would be saved after playing your game). You may need to package as “Development” (maybe “Debug”?) to get the game to save output .
For whatever reason, I’ve had a number of issues with "Well it works in the editor! but not in the packaged build. This is likely anecdotal, but my best advice is to avoid using string variables at all costs (like… no strings whatsoever). Most of the functions I’ve wrote in BP that don’t work in packaged builds had strings in them. So I just rewrote them in such a way so they didn’t need strings, and I was off running.