SharePoint Migration Tool "Issue", classic site to modern

Heya!

I am migrating a Site from SharePoint Server (on-premise) to SharePoint Online with SharePoint Migration Tool.

Everything goes fine but the Site ends up in SharePoint Online as a classic site.

Any ideas if you can migrate a site from on-premise to online and to a modern site.

The site i am migratin is supposed to be a Team-site in SharePoint Online.

Thank you in advance!