Gmail property missing from event fired from gmail add-on contextualTriggers

Question

I'm redeveloping an gmail addon I wrote in the past (yay typescript and clasp) and I'm trying to support mobile. I'm searching the message content using the following to get the message

function onGmailMessage(e) {
  console.log(e);
  // Get the ID of the message the user has open.
  let messageId = e.gmail.messageId;

  // Get an access token scoped to the current message and use it for GmailApp
  let accessToken = e.gmail.accessToken;
  GmailApp.setCurrentMessageAccessToken(accessToken);

This works great on when called from a desktop browser. However, when called from mobile iOS Gmail the gmail property is missing from e. I'm using V8 runtime with the following scopes:

"oauthScopes": [
    "https://www.googleapis.com/auth/calendar.addons.execute",
    "https://www.googleapis.com/auth/calendar.readonly",
    "https://www.googleapis.com/auth/drive.addons.metadata.readonly",
    "https://www.googleapis.com/auth/gmail.addons.current.action.compose",
    "https://www.googleapis.com/auth/gmail.addons.current.message.readonly",
    "https://www.googleapis.com/auth/gmail.addons.execute",
    "https://www.googleapis.com/auth/script.locale",
    "https://www.googleapis.com/auth/userinfo.email",
    "https://www.googleapis.com/auth/script.external_request"],
  "runtimeVersion": "V8",

Should this be available, or is there a different approach to support mobile/iOS?

Thanks -Matt