Scraping data from view-source:https://www.youtube.com/embed/

I have a big list of embedded Youtube videos. Some of them are not available.

I am looking for a solution how to identify them in a big batch of URLs.

Manually it is possible to check in the following way:

E.g., embedded Youtube video - https://www.youtube.com/embed/GdGB0cv6i8I

view-source:https://www.youtube.com/embed/GdGB0cv6i8I

previewPlayabilityStatus - "Video unavailable"

I am trying to incorporate this with Google spreadsheets with the formula

Here is the link to the file: https://docs.google.com/spreadsheets/d/1fHB2UvCVxq4tgNrn_VWlmGyfpXyS-vhbWu57EjUaKsw/edit#gid=0

For some reasons it does not work.