This incident has been resolved. Please see below for additional information:
If you are experiencing an issue and are receiving any messages that reference “expired certificate”, it is likely due to an expired authority within the certificate chain provided by your browser or device operating system.
This issue can be corrected by applying outstanding updates to your browser or operating system. You may be able to perform these updates yourself, but if you have an internal IT support department please contact them for support. You may also contact us if that does not resolve the issue at firstname.lastname@example.org
You can reference this link for your IT support department - https://support.sectigo.com/articles/Knowledge/Sectigo-AddTrust-External-CA-Root-Expiring-May-30-2020