[BUG] Connect to Flow API - Object reference not set to an instance of an object

[wayne-goudie]

Describe the bug
When trying to use the Connect to Flow API, I'm receiving an 'Object reference not set to an instance of an object' error.

To Reproduce
Steps to reproduce the behaviour:

1. Create Azure AD App Registration

Created App registration as per documentation with the following permissions.

Checked that Reply URL is in Mobile and Desktop authentication

2. Entered the correct tenant ID, App ID and Environment ID into 'Configure API Connection' screen