Yup, that was it. Thanks again
I believe your said your we going to modify the page: Containers – Install — Plone Documentation v6.0 with the revised code in the "Start Plone" section.
If so, please consider adding a line above this something to the effect: "The docker run code below is based on the name of the site being "Plone". If you named your site something different, please revise the code below by changing the name"
I realize experienced users such as yourself wouldn't make this rookie mistake; however, I obviously I did and others might.
The instructions were very easy to follow - thanks to the author.