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If your certificate also requires an intermediate certificate, it must be appended to the keypair.  Do so by right-clicking the keypair and navigating to Append Certificate as shown below:.  In the case of self-signed certs, this means clients only need to have the root CA certificate trusted on their system.  In the case of certificates signed by trusted CAs, the clients don't need to have any additional TLS configuration loaded on their system.

Now browse to your intermediate certificate as shown below and click Append:

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