Redirect issue with TeamViewer website

We are trying to access the TeamViewer website (i.e. via https://www.teamviewer.com/link/?url=996951) via our main internet connection.

But we are getting a redirection error.

Accessing the TeamViewer website via https://www.teamviewer.com doesn't work either.

But https://www.teamviewer.com/en/ works.

Switching the language doesn't work.

We are located in Stuttgart, Germany so we'd like to use the German website.

Our internet service provider is Colt.

Accessing the TeamViewer management console works.

Please assist.

Best regards

Dominik