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Tina A
Trailhead Challenge Error TFGLNQMC.
When trying to check the last step in Build Flows with Flow Builder > Build a Simple Flow > Create or Update a Contact in a DE created today, I received error id: TFGLNQMC. It advised I post in the developer forums.
Try in new playground org if you still see issues kindly reach out to trailhead support team.
https://trailhead.salesforce.com/help
Kindly let me know if it helps you and close your query by marking it as solved so that it can help others in the future.
Thanks,