I think Glide uses Cloud Flare and I cannot use www.domain.com and domain.com.
I think this is because Glide needs to disable the Universal SSL and reactivate it. For this, log into your Cloudflare dashboard and navigate to the ‘SSL/TLS > Edge Certificates’ tab. Scroll down until you reach the bottom of the page and click on ‘Disable Universal SSL’.
How do you achieve the www and subdomains?