it will not let me set up since Power BI is not available in our office 365 suite. I am also not allowed to make changes. I am currently working "not signed in" and have already paid for the course. No one seems to be effectively monitoring the discussions.
I am fairly sure you have to create YOUR own company name, even if it is not real. And, it can't already have been used. Don't use one that you know already exists. If you did have a company email I think you should have used it to sign in without using the microsoft service email.