sender ID and profile ID aren’t the same.
Fasih Khatib
2

I’ve just tested it again as I found out that there was also a Facebook issue with parsing the senderIds. Now it does echo back but only to me. When someone else is trying to ping it, I don’t receive any requests from Fb…

Like what you read? Give Dianko Yovchev a round of applause.

From a quick cheer to a standing ovation, clap to show how much you enjoyed this story.