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If you are doing challenge correctly then it can be linked issue. You have to link Trailhead to salesforce.
Follow the below link, do set up your salesforce org to trailhead & complete your challenges.
https://force.desk.com/customer/portal/articles/2643793-trailhead-profile-signup-login-faq?b_id=13478
I hope it would be more helpful for you.
If it solves your problem, mark as a solution.
Thanks,
Arvind Kumar