We have managed to Deploy the Management UX app, however it does not appear to be workign correctly.
I get no option to authorise the App when logging in, and in fact the login doesn't show correctly in the top right.
When trying to select Default Tenant Group, the drop down does not populate, and if trying to type the name, the OK box does not activate
@BrettM : Apologies for the delay. We've made lots of improvements to the tool lately, so definitely invite you to test with the latest (here are the steps https://docs.microsoft.com/azure/virtual-desktop/manage-resources-using-ui ).
If you hit the same error again, please let us know here or as a GitHub issue (outlined in the above link).