Embedded Google Calendar Not Showing

Site URL: https://www.trilakesreformed.org/calendar

I've followed the instructions for embedding a Google calendar into SS and at first it was working fine backend and front. Then it was working in the backend, but not the front (only shows the color background of the calendar). Now it's not working in either place.

Has anyone had success embedding Google calendars with consistent success?

My client needs to embed because the SS calendar is difficult and clunky to use and because it's not printable.

Here's the code google gave me to use.

<iframe src="https://calendar.google.com/calendar/embed?height=900&amp;wkst=1&amp;bgcolor=%238e9db2&amp;ctz=America%2FDenver&amp;src=N2NycDVuZ2RlMW8wZTY4MXJrczBxNW44YjBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ&amp;color=%23795548&amp;showTitle=0&amp;showNav=0&amp;showCalendars=0&amp;showTz=0" style="border:solid 1px #777" width="1200" height="900" frameborder="0" scrolling="no"></iframe>

Any help would be much appreciated.  I have no idea what I'm going to tell my client if I can't get this working. I had them UPGRADE in order to embed this calendar and now that seems like a fail too. So frustrated.