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Kirtish ShrotriyaKirtish Shrotriya 

changed login user name, now not able to login with both the names

while doing module " 'Improve Your Classic App by Moving It to Lightning Experience' -'Set Up Your Salesforce Org' ", i changed my username of trailhead playground, now neither I am  able to login with the old name nor with the new name, it's giving error 404. it's very important to login in that org, please help
Rahul KumarRahul Kumar (Salesforce Developers) 
Hi Kirtish,

May I request you please provide your "USERNAME" of your Account. so we can look into it and do needful help.

Rahul Kumar
Kirtish ShrotriyaKirtish Shrotriya
Hi Rahul, is my user name for trailhead playgorund