Within Teamwork.com, you can view the current spaces linked to your project.

While viewing the project, go to the Dashboard tab.

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You will see a Project Spaces section at the bottom of the left pane.

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Clicking the space name will open that space in a new browser tab.

Note: It is possible to link a project to multiple spaces. However, an individual space can only be associated with one project at a time. 

For more information, see: Linking a Space to a Project