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Meg SweazyMeg 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.
Hi Meg,

 May I suggest you please raise a case with "Trailhead support team" (
User-added image

I hope it will be helpful.

Meg SweazyMeg Sweazy
Thank you, I have emailed to open a case. Meg Sweazy Regional Vice President | Salesforce Mobile: 317-220-0909