Hi Jon Willetts,
Thank you for reaching out to Microsoft Q&A forum.
Better whenever you start the lab don't open other windows until the lab completes.
Sometimes, simply refreshing the page can fix temporary lab issues. If it persists, close and reopen your browser. Clearing browser history or using incognito mode may help resolve cached or extension-related problems.
We tried from our end; it's working fine for us. Kindly check the below screenshot.
If you are still facing any issue, please let us know in the comments and where you are encountering this error along with the screenshot for reference. We are glad to help you.
If the information is helpful, please Accept Answer so that it would be helpful to community members.
Thank you.