My Volt MX Web app does not load in a teams app tab - what can I do?

[BerndGewehr]

When I try to load a responsive/desktop web app created and served by VoltMX in a teams app tab, the page does not load for multiple reasons:

1. The authentication via Azure AD SAML (working ell in the browser) does jump out of teams and opens something in the browser and never comes back to teams afterwards
2. The content of a non-Authenticated app form does not load because of the following console errors in Teams
   

Any idea whether a volt MX app can be loaded in a teams app tab or not? (please bare in mind that I did not write Teams web tab but teams app tab which is a real teams app definition not the website tab)

[BerndGewehr]

I learned to switch the following project property parameter on:

Embedding iFrame has helped:

This does not solve the authentication issue, but it solves the embedding issue. So 1/2 sooved...