Hello, 

I merged my salesforce account (Created with company mail Id) with another salesforce account (created with my personal mail id). Now i removed my company id from the profile. Whenever i try to create a new playgroud in trailheads, it is creating a user with the company Id.

How can i permanently remove the company id from my profile.

NOTE: I removed company id from my profile (Settings). Still it is appearing in new trailhead playground.