Can a guest to a team host a meeting?

I administrate a team for collaboration between 10 different organizations. Sometimes members of the team needs to meet without me or other memebers of the host-organization present, but this is not stright forward: 
1. A guest from an external organization can`t invite to a planned meeting in our joint team. 
2. If external members invites to a Teams-meeting through their own organization, they can't open and work with files in the joint team during the meeting. When they try to switch organization during the meeting, they are thrown out of their own meeting. 

Do you have a solution that will work for us? 

Kind regards

Britt Ellingsdalen