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Karen DionKaren Dion 

I am working through some of the modules in Trailhead - but I cannot get to the playgrounds to try some of the stuff

Rahul KumarRahul Kumar (Salesforce Developers) 
Hi karen,

 Please verify that you are connected to Playground or Developer org.refer 11th and 12th points in the below link for connecting DE org/Playground.
https://force.desk.com/customer/portal/articles/2643793-trailhead-profile-signup-login-faq?b_id=13478.

I hope it will be helpful.

please mark it as best answer if the information is informative.

Best Regards
Rahul Kumar
Karen DionKaren Dion
Hi – this did not work I got this message [cid:image001.png@01D2B8EE.42951740] Best Regards, Karen Dion IS/PE/Services Pricing Analyst Dyno Nobel Canada Inc. A Business of Incitec Pivot Limited 436-15850-26th Avenue, Surrey, British Columbia, V3Z 2N6, Canada Office: +1 604 560 2048 Fax: + 1 801 321 6786 mailto: karen.dion@am.dynonobel.com http://www.dynonobel.com Groundbreaking Performance Through Practical Innovation