Original Post — Direct link

You need to purchase Lightfall in order to switch back to all other subclasses, bungie please fix this asap :)

External link →
10 months ago - /u/BNGHelp - Direct link

Thank you for the report. We're currently investigating this issue.

A workaround to this issue is to open DIM or our Destiny app, click Guardian, click your character, and then select the subclass you want to use. You can also use the loadouts feature.