LTI and Moodle

I have 2 Moodle sites setup and I am trying to test the LTI functionality between them.

They are both running version 3.3.

In Provider site I have enabled the following:

·         Site Administration>Plugins>Authentication>Manage Authentication>Enable LTI

·         Site Administration>Plugins>Enrollments>Manage Enroll Plugins>Enable Publish as LTI Tool

Once enabled, in the LTI Provider site go to a course>Administration>Users>Enrollment Methods>Add Method>Select Publish as LTI Tool.

·         Enter a Custom Instance Name

·         Select the Tool to be Published (Entire course or a Lesson within the Course).  Choose Entire Course.

·         Under Remote System copy the Secret code.

·         Click Add Method – You are taken back to the Enrollment Methods screen that now displays your new Enrollment Method.

·         Go to Administration>Published as LTI Tools

·         Make a note of the launch details (cartridge URL and secret) or just the registration URL for the LTI Consumer site.

In Consumer site:

·         Create or go to a course (Knowledge Hub Setup and Maintenance)>Add a lesson or if a lesson exists Add an Activity>Select External Tool as the Activity Type and click Add.

·         Name the Activity.

·         Preconfigured Tool defaults to Automatic, based on URL.  If I click Add, the screen that loads is blank, no error.

·         Enter the Tool URL, based on the info provided, this is the Cartridge URL from the Provider (Shown above)

·         Enter the Shared Secret

·         Login as a Student

·         Go to course and click on the LTI Activity.  (The course should load at this point, but I just get a blank screen without any error messages (see below)

Any clue as to why the content doesn't load?