Pressing tab when not focused on TV

Hi all

I and my colleagues have an issue where we'll have a Teamviewer session open and will be doing work locally at the same time. This usually works just fine except when we're working on the local machine and we press keys like "tab", it doesn't work. Instead it's tabbing on the Teamviewer session even though it's not focused! Is there any way to stop this as it's driving us mad!

Thanks

Adam