I'm not sure what I've done, but now I can only access the company hub page, and no matter what I do, I cannot get out of the company hub page.
Originally, it was showing that there are no companies, I followed the instructions to create environment link based on the Azure ID in power platform admin center. This then showed the two default trial companies along with the third trial company I've created myself. However, I am still unable to work around BC as I can only use the search function to find pages in pop up while remaining on the company hub.