Below is one way to upgrade a 3rd Party cert before it expires. Get the PFX file and password from the team that handles the certificates.
NOTE: The only browser I’ve had luck with doing this is Firefox. Chrome/Brave and Edge gave me problems but Firefox always seems to work. If you have it, IE also worked.
1. Go to Certificates
Device, Certificate Management, Certificates
2. Import PFX file and fill in the information below
Certificate Type: Local Certificate Name: SAME name that’s being used Certificate File: Location for the PFX file File Format: Select “Encrypted Private Key and Certificate (PKCS12)” Passphrase: PW for PFX