Custom domain loads over wifi but not over phone cellular data

[Bloomzeye]

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What's happening:

My custom domain (page built with Jekyll) loads just fine over Wi-Fi. However, once I tested my domain opening from my phone's cellular service (turned Wi-Fi off), I get an error stating: "A server with the specified hostname could not be found." and in smaller text below that stating: "NSURLErrorDomain"

Some people I've talked to said it loads for them, but then when I checked a friend's phone also over cellular service, my page didn't load.

Some solutions I've tried already:

• Configured and added CNAME to hosting service
• Today: Changed my CNAME file to now say "www.bloomzeyestudio.com" instead of "bloomzeyestudio.com" (Not sure if that made any difference to my issue...)
• Verified my apex "bloomzeyestudio.com" domain in my profile pages setting and added the TXT to my domain hosting service
• Went to my domain hosting service and added the 4 A Records
• Deleted any default A records on my hosting backend
• DNS check of "www.bloomzeyestudio.com" successful (Today: added the www. portion to it)
• Enforced HTTPS
• Windows Powershell Resolve-DnsName, and the IPs correctly point to the 4 GitHub ones

To gain some help:

• What screenshots or details do I need to show what's happening on my end? I'm not getting any errors on GitHub, so I can't tell what's going on.
• I feel like I've tried so many solutions and looked through countless posts here and on StackO (which did help initially!)
• To note, there are now 2 TXT records on my hosting records. The GitHub one, and I think a default one starting with v=spf

Thank you in advanced! I'm a hobbyist front-end web dev (my main bread n' butter is game art/writing/design), so I'm probably missing a technical solution here.

[Bhavanish-Mantri]

This turned out to be an IPv6 DNS issue. My domain resolved fine over Wi-Fi (IPv4), but failed on cellular because mobile networks prefer IPv6 and my domain had missing/bad AAAA records. Removing all AAAA records from my DNS forced IPv4 fallback and immediately fixed loading on cellular. GitHub Pages itself was fine — the issue was incomplete IPv6 DNS resolution.

[Bloomzeye]

Okay, I will try this out! Thank you.

[Bloomzeye]

Update: I did not have any AAAA records to begin with. I decided to manually add the AAAA records to my DNS to see if that would fix the cellular loading issue, but it did not, so I removed those records today.

Also, when I checked dnschecker.org to see what populates for "bloomzeyestudio.com" the CNAME only shows errors for "DNS records haven’t been propagated". On the the other hand, my A records all populate successfully.

I've since talked to my domain hosting platform, and they confirmed that the issue/solution may be between my GitHub domain set up and/or my ISP.

I use Network Solutions (used to be Domain.com), for my domains, so I'm just not sure what I'm doing wrong and how to solve it...