Lumira 1.29 Desktop - Unable to use Geo Map over proxy

We are excited by the possibilities of using geographic charts in Lumira.

However, I am unable to make use of the Geo Map chart over our corporate proxy, even though I've configured the Network proxy settings in Lumira.

In place of the chart, this error message is displayed: "Unable to connect to the Esri map service. Please check network and proxy settings". We are currently at Lumira 1.29.2.

I have not configured the Esri Map Service (Use this account is unchecked), as this is not required.

Does anyone else have this problem? Is there a need to open up certain ports? If so, which ones?

Note: Geo Bubble Chart, Geo Choropleth Chart, and Geo Pie Chart do NOT require ESRI

Thanks.