Hi,
You could verify if the same warning message will prompt if you visit from Client PC web browser.
In general, such kind of"NET::ERR_CERT_AUTHORITY_INVALID" message will occurred with following conditions:
1.The website used self-signed SSL certificate.
2.The certificate of the website has been expired.
3.SSL certificate is issued from non-trusted sources/certificate authority
Thus, to eliminate such error message, you could check the methods shared in below link from two perspectives: website owner and website visitor.
NET::ERR_CERT_AUTHORITY_INVALID Error on Google Chrome – How to Fix?
https://www.clickssl.net/blog/neterr_cert_authority_invalid
Please note: Information posted in the given link is hosted by a third party. Microsoft does not guarantee the accuracy and effectiveness of information.
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Thanks,
Jenny