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You can follow the directions in this article. I'm not going to copy and paste the text verbatim, but basically you want to create a new developer edition (if you don't have one yet), log a case (note, this form does not require authentication), and they'll contact you back to get the problem fixed. They also recommend linking your Trailhead account to one of the available Social Login methods so you can use your social media account to log in to Trailhead.Refer this link https://help.salesforce.com/articleView?id=000231492&type=1
