My android archives and app disappeared from archive manager. Building or Archiving for Publication would complete without error. However the archives wouldn't appear in the list even when showing all. I tried renaming the project and modifying settings, non of which worked. I found the archives were not appearing in the typical "Machintosh HD - Users - - Library - Developer - Xamarin - Archives - " folder. They were instead appearing in an adjacent folder called ErroredArchives.
This was around the time I deleted all my archives for that app through archive manager.
It appears that my Release | ARM platform configuration won't successfully generate an archive. Using Release (Blank aka AnyCPU) or Release | x86 does. This is despite the fact that my x86 and ARM configurations are exactly the same. Not sure why it wouldn't work.
I thought the following worked but I had a different platform selected. Resolve the issue by duplicating the solution folder and using that new copy instead.