Hello @amy.blais !
I tried to set "AllowCorsFrom: “*” " in ServiceSettings of the mattermost_app container. Unforunately there was no change. In Console Inspector I got the output:
"Unhandled promise rejection TypeError: “NetworError whent attempting to fetch resource”.
In Chromium console I get a more specific error:
Get http://mattermostURL:Mattermostport/api/v4/config 403 (Forbidden)
Get http://mattermostURL:Mattermostport/api/v4/config/environment 403 (Forbidden)
Any idea how to solve this Problem?