Cannot Package Game for Win32 With Steam Plugin Enabled

Development Platform & Builds
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I have a Blueprints project that incorporates the Advanced Sessions plugin, and the Steam Online Session plugin, and while I can compile the project for Win64, and it runs without problem, I cannot package the project for Win32 – it fails with “Unknown Error”. To troubleshoot the problem, here’s what I’ve tried:

  1. Create a new, empty Blueprint project. Result: Compiles for 32 bit without problem.
  2. Create a new Third Person blueprint. Result: Compiles for 32 bit without problem.
  3. Changed the DefaultEngine.ini to incorporate the changes required for Steam. Result: Compiles without problem.
  4. The Advances Sessions plugin is installed at the engine level, so its presence has been accounted for already.
  5. Enable the Advanced Sessions, Advanced Steam Sessions and Steam plugins. Result: Will not compile.
  6. Disable all three plugins. Result: Compiles again.
  7. Enable just the Steam plugin: Result: Will not compile.

There must be a setting somewhere that I’ve missed, because it should work. Does anyone have any idea of what my problem is? Thanks.