On creating a meeting we can't set the author of the meeting.

[nzmb]

By default, a user used for authentication has been set as the author of the meeting.
The params of creating booking need to be extended with the author email:

const params = {
  roomId: 'MBPMGDaomwnHawrt6',
  startDate: '2019-01-01T15:00:00:00+00:00',
  endDate: '2019-01-01T15:30:00+00:00',
  subject: 'Fika meeting!',
  confirmed: false,
  pin: null,
  rfid: null,
  **authorEmail: some@email.com,** (can be null)
};