/conversations endpoint returns 500 (code 2, is_transient) — but only for one Page

Hi everyone,

We are running into a puzzling issue with the Graph API and hoped someone here has seen it before.

GET /v22.0/{PAGE_ID}/conversations

     ?platform=MESSENGER

Error we get only for ONE page:

HTTP 500

{

  "error": {

    "message": "An unexpected error has occurred. Please retry your request later.",

    "type": "OAuthException",

    "is_transient": true,

    "code": 2,

    "fbtrace_id": "AIv25knnUDxlaRvUCqr4LfP"

  }

}

• The same call succeeds for all other Pages we manage.

• Fails 100 % of the time for this one Page, for > 36 h now.