APK No Longer Loading On to Headset

I've been able to package my game many times and drag and drop the .apk into the MQDH and it was working just fine. But today it suddenly stopped working. It shows the .apk loading then says the APK Successfully Installed, but the application isn't there. I tried it on older .apk builds that worked before but I'm getting the same thing for them too now. I've tried restarting all my devices. Quest. Computer. MQDH. Unplugged the headset. Nothing seems to be working. Has anyone else had this? Does anyone have a fix?