Starting from v3.0, LMS365 supports modern site collections (Team site and Communication site) and modern pages. We have introduced SPFX web parts to be used on the modern site collections, as well as on any page of the Modern type: Course Catalog, Dashboard, and Course.
Problem: Your external users might get an error when LMS365 SPFX version 126.96.36.199 web parts are loaded on the modern page:
IMPORTANT: The problem in this article has been resolved in LMS365 SPFX version 188.8.131.52 and we recommend you follow this upgrade guide to use the latest version.
External users are getting affected because they have no permissions in the App Catalog site collection (by default, only Everyone except the external user's group has).
Solution: you need to grant Everyone group with Read permissions in App Catalog site collection:
|NOTE: if Everyone group is not available for you to pick and grant permissions, please check this article.|