Hi,
Cert_Auth_Invalid it seems like your machine doesn't trust the root cert in your chain. Check that the root certificate for your chain is in your trust store and valid, all the chain should be valid and not expired. If you are sure everything is fine with Certs, you can lower the security settings on the PC of the browser also check the reg keys you can download and set the ignore flags for certs but test this on One PC to start with.
114865-disable-certificate-error-overrides-microsoft-edge-windows-10-a.html
Hope this helps.
==
Please "Accept the answer" if the information helped you. This will help us and others in the community as well.