I had completed Build an Amazon Connect Integration and moved on to complete Build an Amazon Connect SSO Integration with Salesforce which is essentially the same thing but with SSO authentication into Amazon Connect instead of username/pw.
On reaching the step of testing, the SSO process only appears to be partially working. The expected behaviour is there is a popup that does the SSO which on completion closes, and the CTI phone page within the lightning service console becomes available. Instead what I am seeing is the popup doesn't close, but redirects to the Amazon connect softphone. This means that I am authenticating on the AWS side, but the softphone within salesforce remains unavailable.
I retraced the trailhead steps, and also read through the latest newly released amazon docs but can't seem to find anything I have done different to what is described. What am I missing?