Hi @Arioule ,
Do you want to sync your Microsoft Teams Groups to your CDS Teams Entity?
If you want to sync your Microsoft Teams Groups to your CDS Teams Entity, import in the same time associations between Users (in CDS User Entity), I afraid that there is no way to achieve your needs in PowerApps currently.
Currently, within PowerApps app, there is no action supported under Teams connector to retrieve these Required properties (e.g. Administrator, Organization, etc) for creating a Team record in Teams Entity.
If you would like this feature to be added in PowerApps, please consider submit an idea to PowerApps Ideas Forum:
https://powerusers.microsoft.com/t5/Power-Apps-Ideas/idb-p/PowerAppsIdeas
As an available solution, you could only create Team record for each of your Teams Group in your Teams Entity manually. Please go to "Power Platform Admin Center"-> find your own current environment-> Click "Settings"-> expand "Users + Permission" option, then click the "Teams" option:

Best regards,