Create a sharepoint teamsite for an existing Team/Group

Dear Microsoft-Team,

we have the following problem:

We had an Office 365 Group which was converted into a Team according to the tutorials found on your websites. 

Now we want to create a sharepoint teamsite for that team.

Problem:

We can't find the option to create a teamsite anywhere within Microsoft Teams or the Office 365 Admin Console (Group section).

When I go to Sharepoint and create a new site I cannot find the option to create from an existing team/group (that's what worked perfectly when creating a new team from an existing office 365 group) and when I try to use the existing name/group-mail-address it gives me an error saying the name is already in use.

Goal:

Create a sharepoint teamsite for our existing team (which was created from an existing Office 365 group) without having to use a new name or creating a new group/e-mail address which we don't need.

Any help would be greatly appreciated.

Cheers,

Sascha Becker