I have an app which displays the Picture for a person column in a sharepoint list, along with the name and other data. The pictures display correctly when I run the published app in a browser (Chrome).
In a browser:

I have also added the very same published app to a Tab in Teams for ease of access, but unfortunately, in Teams, the pictures are not displaying. (As above, the pictures should be displaying right in from of the large blurred box).
In a Teams Tab within a channel of a Team:

Also, I should note that when I choose a new person, the people picker also fails to display the picture of the individual. It only displays name and email. When I add someone via the browser version, all 3 fields - name, email and picture - display as planned.
My question is: Why are pictures not showing up under Teams within the app and what can I do to get them to display?