Problem with phones certificate

[proof]

Whenever I try to log into the webui of my Yealink phone I get the following certificate error:

Your connection is not private
Attackers might be trying to steal your information from [phones ip redacted] (for example, passwords, messages, or credit cards). Learn more
NET::ERR_CERT_AUTHORITY_INVALID
Subject: yealinkgeneric

Issuer: Yealink Equipment Issuing CA

Expires on: Nov 6, 2033

Current date: Apr 15, 2020

Is there a way to correct this so that this certificate error does not present itself?

Normally, I would just hit Advanced and then continue, but this is causing an issue with remote dialing. Every time the computer is restarted I must authenticate in the browser one time in order for remote dialing to work properly.

I would like to know how to get a valid, trusted cert installed to avoid this issue,

Any help is appreciated.