Site unreachable on Glo Nigeria, works fine on MTN

Environment

Hosting: Vercel Hobby

Affected ISP: Glo Nigeria

Working ISP: MTN Nigeria

Deployment URL: https://studysphere-liard.vercel.app

studysphere-liard.vercel.app

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Problem

My deployment is completely unreachable for users on Glo Nigeria — the page never loads, no error, just a blank screen or spinner indefinitely. The same URL loads normally on MTN Nigeria and on Wi-Fi.

This looks similar to reports I found from other Nigerian developers on this forum, e.g. "Custom domain unreachable on Glo Nigeria, but vercel.app deployment works" and "Custom domain intermittently unreachable on Globacom (Nigeria)."

Would appreciate help figuring out whether this is a routing/edge issue on Vercel's side for this ISP, and any steps I can take.