Super Bundle - User does not exist?

Hello,

I have taken out a super bundle with Freeletics and received an email saying that I have access to other apps such as Skill Yoga and that I should log in there with my Freeletics login details. When I do this, however, the message appears for all other apps: User does not exist. My email and password are exactly the same as for Freeletics, I have checked this several times. Any idea? Thanks a lot!