Ignition edge - Siemens S7-1500 certificates

Got a Ignition Edge, communicating with a Siemens S7-1500 as a OPC client connection.

When I added the siemens client, I marked it as "Trust Certificate", and using the security mode/policys.
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I saw the certificate getting added under "C:\Program Files\Inductive Automation\Ignition\data\opcua\client\security\pki\trusted\certs"

When all is configured, I'm getting the error :
Exception caught: UaException: status=Bad_SecurityChecksFailed, message=java.security.InvalidAlgorithmParameterException: the trustAnchors parameter must be non-empty

This causes the connection to "Fault".
By unchecking the Certificate Validation Enabled, the communication starts working.

I'm not all to well versed in certificate config, I can't see what to do next to get this working with the enable checked. What am I missing?

I would think it means the S7's OPC Server is using an unsigned certificate.

Can you share the certificate? It might mean the certificate is not a self-signed certificate, in which case the CA/root cert is needed as well.

The certificate is self-signed.
I'm not able to get the certificate at the moment

Ok, leave the validation option disabled for now, and when you're able to get the certificate to continue troubleshooting let us know.