Android Wallet - Credential is in an outaded format

I’m currently working on Blockcertes for my thesis and I have created my own certificate with cert-tools and cert-issuer in the bitcoin testnet but, when I try to view my certificate with the app “Blockcerts”, for android, I get a problem.
The certificate is visible, the various info are readable and can be verified but, when I try su view my credential on the app I get the error message: “This credential is in an outdated format and cannot be displayed correctly.”

I have created it with the V2 version of cert-tools.
Is this a common error for the V2? How can I fix it ?