Entering Youtube url into XFMG immediately leads to error

[Alpha1]

Affected version

2.3.4

I'm not sure if this is a permissions setting or a bug.
If I go to the media gallery here to add a new entry I select new album:

https://xenforo.com/community/media/albums/create

Then I select Embed Media and enter the following url into the modal:

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This will immediately result in the following error:
You do not have permission to view this page or perform this action.
YouTube is listed as an allowed site, but its not allowing a YouTube link.