Hi, and thanks for a good plugin! We work with a number of multisites and the environment variable config option is much appreciated.
We also face a similar issue where a few of the multisites have no issues with embeds, while some other multisites on the same server fail with the embed.
On the sites where the embeds fail, we see the following error (I removed the specific trace ID:
{"error":{"message":"Error validating application. Cannot get application info due to a system error.","type":"OAuthException","code":190,"fbtrace_id":"xx-xx"},"html":false}
The request URL:
https://www.website.com/wp-json/oembed/1.0/proxy?url=%5Binstagram/fb-url%5D&_locale=user
