The Vimeo link for my virtual tour isn't working

Typically, a Vimeo URL has the format of https://vimeo.com/XXXX, but this won't work for the virtual tour.

You'll need to use the embed version of the Vimeo URL for the virtual tour, which uses https://player.vimeo.com/video/XXXX

For example:  

Instead of using:

https://vimeo.com/187407569

Use:

https://player.vimeo.com/video/187407569