Employee given invite, he installed, but after installing CC app Audition under his account email, it still says 'trial', on admin side, it says 'pending user' and not 'active.

I am the admin in my company, and out of all the licenses, he is having a problem with this. And this is the second try. We tried with the company email for him, and it didn't work. We are now trying with his Gmail, and there is still a problem.