Web app integration doesn't work if SSL is required

Hello,

We have an app released to the Box App marketplace for a long time now, but we've just discovered that if we check "Require web app integrations to use secure connections (SSL)" in enterprise settings - the app cannot be added. All of the urls are https and have proper ssl certificates installed.

What can we do to resolve the issue?

App: https://app.box.com/integrations/ares_kudo_dwgdxf_cad_viewer_for_box/i (client_id: 2j93yprw2jfctez000zb5d3cy55asa08)