I see, I doubt it’s related to the plugin code, it’s most likely the android compiling workflow (in the UE4) in which something is failing.
I remember, when setting up Android compiling, you have to install the SDK and select everything relevant to you right? Perhaps you didn’t select the 64 bit libraries/options needed for 64-bit arm64 compilation?
Also I would post this problem on the UE4 answerhub, Epic employees will usually help you and look into it when you post a bug report on the UE4 answerhub. That being said, I think it’s most likely a problem with the libraries/options thing I talked about earlier, since something like that could easily cause the problem you’re having. If that isn’t the case, then I would most definitely post it on the UE4 answerhub to get help with this problem.
Also, just to isolate the problem, you could try packaging a UE4 C++ project to android 64-bit arm64, just to make sure it isn’t anything in the plugins that’s causing this. If you post this problem on the UE4 answerhub, they’ll most likely ask you to do the same thing as well, so you’d save some time by doing that in advance already.
Anyway, I hope that helped.