You need to exempt traffic from SSL Interception in Cloud SWG (formerly known as WSS). For example, Banking and Healthcare categorized sites are often exempted for compliance reasons.
Cloud SWG
To add a destination or source to SSL Interception exemptions:
For additional information on SSL Interception, please visit the following topic:
About Scanning Encrypted Traffic
Note: After the SSL exemptions are added to the list, the Web Security Service will NOT SSL-decrypt traffic from these sources or to these destinations. Currently, traffic sent from a mobile device (iOS or Android) is always exempted from SSL Interception.
Note: Please make sure SSL exception rule is added on top of SSL interception rule (if any for the same URL or category) in order to take priority.