Digital Signature Error on PMRPY Site: How Can I Fix This Verification Issue?

I have successfully registered my digital signature through a USB device on the EPFO site. However, when I tried to verify the signed PDF on the PMRPY website, it prompted me with "NOT Supported yet." My Java version is the latest, the browser is up to date, and Adobe PDF is also up to date. Can someone please suggest a solution to clear this error?

Sir,

Kindly check the status of your registered digital signature on the employer portal to verify if it has been approved by the EPFO office. If it has not been approved, please submit a letter to the EPFO office in triplicate copies.