New messaging threads result in "(#551) This person isn't available right now." error
Created by Sam McEvoy ·  · Facebook Team — December 2, 2020 at 4:15 AM
Current State
We are currently investigating an issue where posting to new messaging threads results in an error. The error looks like this:

"error": {
"message": "(#551) This person isn't available right now.",
"type": "OAuthException",
"code": 551,
"error_subcode": 1545041,

Sending messages in pre-existing threads does not currently seem to have this issue
Start Time
November 28, 2020 at 1:00 AM
Last Update
December 3, 2020 at 6:14 PM
Updated: December 3, 2020 at 6:14 PM
Thanks for your patience while we investigated this issue. This issue should be resolved now. Please do note that the users would have to start a message with your pages again before you are able to... send them messages. See More
Updated: December 3, 2020 at 4:54 AM
We're still investigating this issue
Fix Pushed
Updated: December 2, 2020 at 12:35 PM
We've pushed a fix for this issue.