When I just checked on my own site, I used the page URL where I was watching a video (hidden link), and I also tried with the link generated by Youtube when using the share button (hidden link).
Both worked correctly.
But it looks like you are trying to embed youtube short videos (introduced last year), which have a slightly different format for the URL, which Toolset doesn't recognise.
On my test site I'm outputting the videos using the Toolset Youtube block, and that is when the problem occurs.
But if you output the video using a Types shortcode, it does work correctly, even with the short video URLs.
If necessary you can use a shortcode block (or other text-based block that parses shortcodes) to add the shortcode to output the video, which would look something like this:
OK, I can't tell from your screenshots why it's not working when using the shortcode.
Could I get access to your site to look for myself?
Let me mark your next reply as private so that we can get log-in credentials from you—you may want to create a temporary admin user for us to use that you can later delete. And be sure to have a current backup of your site.
Can you also confirm the url of where we can see the problem. It looks like you are editing a Content Template.
The custom field is a URL field not an Embedded Media field.
The Youtube block can accept a URL field as a Dynamic Source, but as we have discovered it does not recognise the new short Youtube video URL format.
The types shortcode will only output a youtube video if it is an Embedded Media field type. A URL field can only output the URL or a link with that URL.
Try changing the field type to Embedded Media, and then you should be able to use the types shortcode to output the videos.
I checked on your site with the exact same simplified set up I have on my own test site (where this works), with a test page called "Nigel", which has a value for the embed custom field and outputs the field in the page body using the types shortcode.
And on your site it is not working.
Can we check for conflicts from other plugins? Disable all plugins except for Types and see whether it works. If it does, that means another plugin is interfering with the process, and we can determine which through a process of elimination, re-activating plugins and re-testing.
That page doesn't contain anything related to this issue as far as I can see, it just contains a form.
I checked on the test page I created previously—hidden link it does appear to be working correctly, which suggests a conflict with some plugin is the issue, if you want to re-activate the plugins you need to check.
Sorry, I'm going down rabbit holes that seem unrelated.
The test page has a form, which on submission redirects to a page which doesn't have any content related to the problem, which is displayed using a content template that contains about 30 conditional blocks.
Can you please demonstrate the problem on a simple test page that only contains what is specifically required to demonstrate the problem?
I know the developers are planning to look into the problem with the youtube.com shorts URLs not working with the youtube block, and we may need to wait for that solution.