Privacy Settings on Video

Hi all - I know this has been asked as I've searched the forum, but couldn't find the answer. 

I am trying to embed video hosted on vimeo. It is set to 'hide on vimeo' only show on domains... but what's the domain I enter? I can enter fitandfeelgood.co.uk, but when I've gone through this process there usually needs to be a Squarespace web domain as well. I can't seem to get it to show and I don't want to set my videos to be watched by 'anyone' on vimeo as they are part of my membership programme.

Thanks in advance,

You'll most likely want to add every domain that someone might be accessing your website on. In reality, this should be your primary custom domain and your Squarespace built-in domain. You should be able to add both.

https://help.vimeo.com/hc/en-us/articles/13806764653201-How-to-change-your-video-s-privacy-settings