Update:
Tried the following, and still get the Page Not Found message when viewing content:
- Setting the LMS_BASE_URL value
- Setting ENABLE_MFE_CONFIG_API to true
- Toggling the following for the plugin:
Trying all four permutation states of the courseware.use_legacy_frontend
and course_home.course_home_use_legacy_frontend
states does not seem to work either.