Cannot log in

I am trying to use the cost-free version of Teams but cannot log in. When I am trying to log in there are two Microsoft accounts connected to my email address (also same password).

When I try the first one (personal account) I receive the following information: "Someone has already configured Teams for the organization Ask the administrator to get started with Teams or set up another organization in Teams using a different email address."

When I try the second one (Work/School): "Welcome to Teams! You do not have access to the organization futurefirst.se in Teams. Select another organization or contact the administrator for more information. Selectable options: Awave AB (Guest).

I would like to try Teams but as it is now this is not possible. Can someone please help?