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Alexandra KesmanAlexandra Kesman 

Work With Custom Lightning Components - My Domain Broke my trailhead playground?

I'm working on the Trailhead module: Lightning App Builder - Work with Custom Lightning Components

https://trailhead.salesforce.com/trails/lex_admin_migration/modules/lightning_app_builder/units/lightning_app_builder_custom_comps?trailmix_creator_id=00550000006yDdKAAU&trailmix_id=admin-keynote-dreamforce-2017 

I followed the instructions to setup 'My Domain' as part of the instructions inside the module, and then it said I would get an activation email (which has not come) and now I'm unable to access any part of my Trailhead Playground 1. I get a huge 404 error page:
User-added image


"https://trailhead.salesforce.com/launch_org/242351" is what the launch button gives me. How do I get back to it? Do I need to make a new trailhead playground and do something differently? Should I use my developer org instead? 
Saurabh TyagiSaurabh Tyagi
Hi Alexandra,

The thing with trailhead playgroud is that its domain is already customized and can be changed only once so you don't need to change domain name of trailhead playground, But if you remember trailhead playground's username and password you can try login in incognito window.

you can also refer this link to recover your trailhead playground's  password and username.
https://force.desk.com/customer/en/portal/articles/2659738-find-the-username-and-password-for-your-trailhead-playground?b_id=13478

If you are still unable to login then i would suggest that you do not waste your time and make a brand new trailhead playground.

good luck!