I'm glad to hear engineers are working on this.  To be clear, the recipient address or number of recipients is not the issue for us.  We have tested multiple scenarios.  Also, configuring gmail to allow less secure apps may be a workaround, but we need to be able to use the enhanced security solution that Intuit developed a few years ago.  Gmail has been threatening to end support for less secure apps for a while now and I'm surprised to learn that it's still available.