Sitemap not generating at /sitemap.xml

Here is my site Read-Only: https://www.ironperformance.ca

We have the Webflow option to generate the sitemap set up but it will not populate at /sitemap.xml

Custom domain assigned, but yet also does not populate when attempted on the Webflow subdomain at /sitemap.xml

I can submit this URL to Google Search Console for indexing no problem, but cannot visually see this to navigate pages.