APM Exchange 2016 iApp and Teams new REST v2.0 API (/api/*)

We have deployed the Exchange 2016 iApp for some time, using APM pre-authentication. This has always worked fine...

We are currently deploying Teams and we notice that this does not work properly with the Exchange 2016 iApp. Apparently Teams makes use of 'new' (as of 2017) Exchange REST 2.0 API calls:

       https://webmail.oursite.com/api

(note "/api"). Also see https://techtalk.gfi.com/are-you-ready-for-the-new-exchange-apis/ and https://techcommunity.microsoft.com/t5/exchange-team-blog/on-premises-architectural-requirements-for-the-rest-api/ba-p/605609 .

Currently, when accessing the above URI (/api), we are presented the APM login page (as if we were accessing "/owa"). We need to change the Front End authentication for "/api/*" to the same authentication method we currently use for the "/autodiscover/*" and "/ews/*" URIs.

Can this be done using the iApp?

Has anyone figured out how to add this functionality to the iApp (manually, leaving 'strict update' mode)?