By default KanBo is utilizing global service URLs for integration with Office 365. This leaves the installations done on GCC High Cloud unusable without a simple tweak to the appsettings.json of KanBo

Tweaking the KanBo appsettings.json

Please find this section in the appsettings.json of Your KanBo…

{
    "type": "package",
    "name": "auth-aad",
    "client-id": "--",
    "tenant": "--",
    "thumbprint": "--",
	"admin-upn": "user@domain.com"
   },

…and add these to lines to the section:

{
    "type": "package",
    "name": "auth-aad",
    "client-id": "--",
    "tenant": "--",
    "thumbprint": "--",
	"admin-upn": "user@domain.com",
    "aad-url": "App registration and token service root endpoint",
    "graph-url": "Microsoft Graph and Graph Explorer service root endpoint"
   },

Of course, the “aad-url” variable and “graph-url” variable need to have appropriate values written in. To find the appropriate URLs, please visit Microsoft’s Microsoft Graph national cloud deployments page and check the “App registration and token service root endpoints” and “Microsoft Graph and Graph Explorer service root endpoints” sections.

After saving the changes, please make sure to restart Your KanBo.