How to resolve the “certificate could not be added, unable to read the provided PEM file. Missing key or certificate”

The PEM file should contain both the certificate and the private key with the following structure :
—–BEGIN PRIVATE KEY—–
 
…………………………………
 
…………………………………
 
…………………………………
—–END PRIVATE KEY—–
—–BEGIN CERTIFICATE—–
…………………………………
 
…………………………………
 
…………………………………
—–END CERTIFICATE—–
 
Also please make sure that the PEM file you upload is not password-protected because password-protected PEM files are not supported.