I know it's possible to share a preview of your store with someone even if it's password protected. You go to the theme within the Online Store section. Select 'preview' from the dropdown list, and when that page opens, you should see a purple 'Share Preview' button. The only problem is that purple button says 'Customize' for me and it takes me to the theme customization screen.
The odd thing about this issue, is that it worked yesterday, and is still working on the free themes I have on my site. Not sure how to fix this. Hopefully someone has an answer...
Here are some related errors I see:
A preload for 'https://cdn.shopify.com/shopifycloud/shopify/assets/admin/style-b79115bbdc011f28f2957d9539ef45c64fd5...' is found, but is not used due to an integrity mismatch.
The resource https://cdn.shopify.com/shopifycloud/shopify/assets/admin/style-b79115bbdc011f28f2957d9539ef45c64fd5... was preloaded using link preload but not used within a few seconds from the window's load event. Please make sure it has an appropriate `as` value and it is preloaded intentionally.
It doesn't happen on the site's debut theme so its related to the theme we installed.