As Internet Explorer support ended, users are now directed to an error page. To access Howspace one needs to use the URL found in their email in a modern browser.
If you ended up on the 'Ancient Browser Found' error page, you will have to change to a modern browser. But simply copying the URL from the error page will not work, as it will direct you back to the error page.
You need to go to your email, and copy the link from your invitation. The best way is to find the URL from the bottom part of the email, use this link in a modern browser. This will let you access the workspace normally.