Custom search no longer working
 

So just recently I've been unable to use the custom search (google) feature which used to be the only search I would use, I finally realized there's another search function above it.

Anyway I don't know if its ever going to get fixed but usually the first step is knowing that its broke.
The message I get each time I try to use it is the following:
"Unauthorized access to internal API. Please refer to https://support.google.com/customsearch/answer/4542055"


The link seems to indicate that its an issue with the website.

This happens on 2 different systems, logging out and back in didn't help.