Embed Calendar App in Sharepoint

I'd like to start by saying I have other Smartsheet calendars that are successfully embedded on a SharePoint site. However, I recently created a new calendar and for whatever reason I cannot get this one to show up on SharePoint.

I've created a dashboard and pointed the calendar app to the dashboard, then published the dashboard allowing full access and copied the embed code. After doing so, I pasted the embed code into a web content widget on SharePoint but still end up with the error message "calendar.smartsheet.com refused to connect." I am not convinced that this is an IT permissions issue as I have other calendars embedded onto SharePoint that work perfectly fine. Is there something I'm missing here?