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Sudheer BabuSudheer Babu 

Trailhead issue for completing challenges

HI All,
I was trying to complete my challenges by logging in to DE org but was getting below error . I complete 11 badges with the same org not sure what has changed since then. Any help in resolving this is appreciated. Error Image

Houston, we have a problem.
You are attempting to log into Trailhead to complete challenges with an org that isn't supported.
Please make sure that your Org is
A Developer Edition Org (it cannot be a Production or Sandbox Org) and
The Developer Edition Org does not have a namespace assigned to it.
Error
NagendraNagendra (Salesforce Developers) 
Hi Sudheer,

Sorry for this issue you are encountering.

May I suggest you please reach out to the trailhead support team for better and quick assistance on the above issue.

Please log a case with trailhead support team with the respective org username so that they can look into it and can help you accordingly.

You may reach trailhead support at the below email address. Hope this helps.

Kindly mark this as solved if the information was helpful.

Thanks,
Nagendra