Badge Verification fail.

[mihirtechark]

Greetings for the day!
I have generated a downloadable badge image by BadgeOS plugin. When I trying to validate it from https://badgecheck.io/, it is not validating. It return error: FETCH_HTTP_NODE: Unknown Content-Type (Not image/png or image/svg+xml). Response could not be interpreted from url https://vastudentservices-clc.org/assertion-page/?bg=812&eid=514&uid=1. I can not get how can I solve this issue.