As a temporary fix, you can edit C:/Program Files/Epic Games/UE_4.26/Engine/Plugins/Runtime/AR/Google/GoogleARCore/Source/GoogleARCoreBase/GoogleARCoreBase_API_.xml and set the com.google.ar:core dependency to 1.19.0 before packaging a build. I’ve tested this with multiple phones using Android 11 and via the Google Play store, thus far it has worked every time.