How to install self-signed certificate

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I’m trying to install a self-signed certificate but when I don’t enter the CA Bundle I get the error “Certificate verification failed! The system did not find the Certificate Authority Bundle that matches this certificate. Contact “[Me]” to obtain the Certificate Authority Bundle for “local.domain”.’

But when I do enter the CA bundle I get the error ” (XID yfkxmt) This certificate is self-signed, but you submitted a CA (Certificate Authority) bundle with it. “…

How to install self-signed certificate