curl --request POST \
  --url https://api.magne.app/v1/dm/conversations/{conversationId}/ack \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "lastReadMessageId": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}
'

{
  "error": "<string>"
}