Hi HkanJoeIsson-5829!
As LeonLaude said, the guest experience has limitations by design. Here is a list of some of the functionality that isn't available to a guest in Microsoft Teams:
*OneDrive for Business
*People search outside of Teams
*Calendar, Scheduled Meetings, or Meeting Details
*PSTN
*Organization chart
*Create or revise a team
*Browse for a team
*Upload files to a person-to-person chat
*Currently, Teams supports only State 1 and State 2 types of guest users as defined by Azure B2B