Issue submitting sitemap.xml to google search console

[TimeBoxPhotos]

My primary domain is timeboxphotos.com.  I am unable to submit the sitemap https://timeboxphotos.com/sitemap.xml or http://timeboxphotos.com/sitemap.xml to google search console.

Both site Maps load and render fine in Chrome, Edge and Firefox.  

I can add http://www.timeboxphotos.com/sitemap.xml and https://www.timeboxphotos.com/sitemap.xml however all the child site maps fail since they have the default domain url of timeboxphotos.com

all of the child sitemaps also load and render fine in Chrome, Edge and Firefox

Has anyone had similar issues?