If you see an error like this, it's probably because your IT admin has introduced restrictions on the apps that can access Google APIs. We access some of Google's API's in order to allow users to save mote content to their Google Drive, and to insert this into Slides.
NOTE: this could also be caused by changes made by Google, explained in this article.
If you see this error, please share this article with your Google Admin.
If you're the Google Admin, please consider reviewing and updating the API restrictions on your account:
Check out this Google Article for more info - https://support.google.com/a/answer/7281227?hl=en&ref_topic=10021546#zippy=%2Creview-the-third-party-apps-in-your-environment%2Cmanage-access-to-google-services-restricted-or-unrestricted
And here's a video showing where these settings are within the Google Admin console.