There seems to be a limitation on HTML formatting via API when adding notes or comments to tickets/conversations. Some HTML formatting is allowed and parsed just fine, but tables specifically are stripped out and left unformatted. We have an integration where the best way to surface the information to our customers is via table, and this limitation makes our comments back to customers more confusing than they need to be. HTML formatting is pretty standard in text API calls, so I think this is a pretty big oversight and should be added into the availability of the API.