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Mary Cusack 1Mary Cusack 1 

Set Your Org's External Org-Wide Defaults challenge Your external org-wide defaults aren't configured correctly. Repeat the steps to make sure they are.

This is driving me crazy.  This is on the Share CRM Data with Your Partners  module.  it says to set account and contract and opportunity to public read only for internal and private for external and it still says I'm not configured right.  
SandhyaSandhya (Salesforce Developers) 
Hi,

Make sure that you are connecting to the same org from 'Launch' where you have done your work.And also make sure that you are using brand new trailhead playground for this project as stated in the first unit.

Please mark it as solved if my reply was helpful, it will make it available
for others as a proper solution.

Best Regards,
​Sandhya
 
Harry GoldmanHarry Goldman
I'm having the same issue, and I did confirm the playground is the same one I am validating against. Still get:

Your external org-wide defaults aren't configured correctly. Repeat the steps to make sure they are.

This is driving me crazy!  Did you get it working? @mary_Cusak_1
Harry GoldmanHarry Goldman
Nope.  I went on to another trail, and to be honest, I don't remember which trail this was on.  Post it so I can try in another playground.