Power BI workspace and Microsoft Teams - how to disconnect? Switch off Aadsync?

[DNKL]

Hi, 

I have built a Power BI report that is located in a workspace, and published as an app. 

The report is built on multiple Excel sheets located in a Microsoft Teams folder, which are edited by around 35 users that are members of the team. 

Today I realized that all of the members of the Microsoft Teams team were also suddenly members of the Power BI workspace - while I never intended this to be the case. When I deleted these members from the Power BI workspace, they were also automatically removed from the team in Microsoft Teams, where I could see the following messages (x35): 

How can I switch off this connection between Microsoft Teams and Power BI?? I do not want all team members to be able to see the workspace in Power BI - I only want them to be a part of the team in Microsoft Teams.

Thank you in advance for your help! 

[lbendlin]

ditch that workspace altogether and create a new modern workspace in the Power BI tenant.

Thankfully that disruptive behavior of Teams creating a (classic!!!) workspace can now be disabled by your Tenant admin.