Debugging local teams app not possible anymore

Question

I have problems in debugging a local teams app using side loading within teams.

The issue can easily be reproduced by following the below steps :

1) Create a teams app (using the installed teams toolkit)
2) Project -> Teams Toolkit -> Configure Micrososft Teams app (this is without issues)
3) Start the app from Visual Studio

You will be presented with a message stating the app cannot be found or you do not have access to it.

I have noticed a http 500 error from https://teams.microsoft.com/api/appstudio/appdefinitions/{appid}/manifest?tenantId={tenantid}

When starting the session within teams the given api call is done to retrieve the manifest. As this request fails I am assuming this will result in the given message within teams; the application manifest cannot be found.

Do I need to take additional steps or am I missing something ?