Zscaler is a global cloud-based information security company that provides internet security, web security, next generation firewalls, sandboxing, SSL inspection, antivirus, vulnerability management and granular control of user activity in cloud computing, mobile and Internet of things environments

If the organisation is using Zscaler, please make sure that the two URLs below are added in the Site Whitelist and SSL Inspection:
.groups.caremonkey.com (same as the first one but with a period at the beginning)

For further information how to add these two URLs, please refer to these support articles from Zscaler website: 

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