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keerthi Thattekeerthi Thatte 

i cannot see any sessions app while solving the challenge import the data units

SwethaSwetha (Salesforce Developers) 
HI Keerthi,
Trailhead Help (https://trailhead.salesforce.com/en/help?support=home)can provide assistance for situations where Trailhead does not appear to be functioning correctly. You can reach out to them if this is the case.

Hope this helps you. Please mark this answer as best so that others facing the same issue will find this information useful. Thank you
keerthi Thattekeerthi Thatte
Hai Team! I am not able to login to my trailhead account. Can you please look into it once. Username is : keerthi.thatte-xfec@force.com Please get back to me as soon as possible .As I have my all learning record Hoping for a positive response Best regards Thatte Keerthi Assistant System Engineer Trainee Tata Consultancy Services Limited Mobile: +91 9490106776 Mailto: keerthi.thatte@tcs.com Website: http://www.tcs.com
SwethaSwetha (Salesforce Developers) 
HI Keerthi,
Have you logged a case with Trailhead Support?Can you share the case number so I can check with the concerned team?

Thank you