Also repeating my edit notes here, since this may be useful in the future, and it's easier to search the forum than edit notes:
You can still lookup works by the COCV/SACEM ID using a URL like this: https://sigried.sacem.fr/oeuvres/oeuvre/printOeuvre.do?cocv=7300202211
However, that site seems to be pretty broken. I have to clear cookies or use a new incognito window for each search, otherwise I get an error.
To find the COCV based on the title and artist, use this search page, find the work you want, click "Version imprimable" in the bottom left of the popup, and the COCV will be in the address bar.