Sales Trial Environment Power Apps Import Data Connect to Data Source stuck on Loading Connections

[Syndicate_Admin]

Hi, hope this is the correct forum location.  I started a 30-day free trial of D365 Sales to learn Power Apps. In Sales Trial Environment I was able to create a Table, but when I go to Import Data from SharePoint Online List, the Power Query window just hangs on Loading Connections... and never asks for credentials. I've tried changing the Implementation and Avanced Options but didn't help.  I know the SharePoint site is valid, and I was able to create a connection to it in Connections by adding the site and entering credentials.  It seems to be a glitch in the Tables' Import Data window.  Tried in Edge and Chrome and had same experience.