Installin a new DigiCert Global Root G2 certificate to Polycom Trio 8800

Hi All,

I'm seeking for some help regarding this recent comms: 
https://support.zoom.com/hc/en/article?id=zm_kb&sysparm_article=KB0061202

Trying to prepare our Polycom based meeting rooms so they still work with Zoom (CRC) .

While I can easily add the certificates to Polycom Group Series codes and Polycom VisualPros, I seem to have issues with Trio 8800.

I'm following the official Poly guide and basically copy-pasting the link for PEM format:
PEM format: https://cacerts.digicert.com/DigiCertGlobalRootG2.crt.pem

On the Trio 8800 under network /TLS I'm pasting this to Application CA7 but when hitting the Install button the error message says "The SSL certificate file failed to download"

Anyone successfully added this cert?