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Meg Sweazy
I am getting the following error in the Org62 Basics - Personalize Your Chatter Experience.
Rich-text editing is disabled because the LockerService critical update is activated. Your Salesforce admin can deactivate the LockerService critical update in Setup.
May I suggest you please raise a case with "Trailhead support team" (trailhead@salesforce.com)
I hope it will be helpful.
BestRegards
RahulKumar