Log into cloud.entrust.net and follow the steps described in Downloading a CA certificate to download the certificate chain of the following certificates:

• The LDAPS TLS certificates.
• The WSTEP-enrolled certificates.

Specifically, you must download:

• The certificate of the issuing Certificate Authority. 
• The certificate of the root Certificate Authority. 

If the LDAPS TLS and WSTEP certificates are not issued by the same Certificate Authorities, you must download both certificate chains separately.