Hello,
Since Arcgis enforces https recently, our open data site(https://hub-maconbibb.opendata.arcgis.com/), custom domain: www.maconinsights.com, has issue with https.
Browsers will block site at the first visit and states it's not secure. If we attempt to visit site as https://www.maconinsites.com , it states that it's not secure with invalid certificate as the following figure.

I have already followed this article Configure site settings—ArcGIS Hub | Documentation , but still experience this issue.
Please advise me how to correct this issue.
Thanks.