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Lizeth SánchezLizeth Sánchez 

Pleas Why error enter mi domain?

My Domain
ArreyYaarArreyYaar
Hi Lizeth,

I reckon you are trying to launch your trailhead sandbox separately. Try appending /one/one.app to your url after my.salesforce.com - for instance your url will end like this .. my.salesforce.com/one.one.app.
Please see that this will lead you to the page where you need to provide your login credentials. 

If you are not using the below to launch 
User-added image
Please refer the article on how to create userid and password for the trailhead sandboxes so you can login via url ...https://force.desk.com/customer/portal/articles/2659738-how-to-get-a-password-for-my-trailhead-playground?b_id=13478


Hope your query is answered, please mark this as your answer. else please let me know for more queries.