The embed extension stopped accepting the Airtable share link format
https://airtable.com/shrXXXXXXXXXXXXXX in late 2022. In order to allow an embed extension to function properly, you’ll need to adjust share links to include:
/at the end end of the URL
The result should look something like this:
Note that this differs from the iframe embed code created when you choose to create an embeddable share link.