Overview
As of January 20, 2021, we have received customer reports of users experiencing "401 access denied" errors when clicking Time-of-click links in emails.
If you are experiencing this issue, please raise a support case and attach the affected email as a sample (in RFC822 /.eml format) and mention the ID XGE-18542.
The KBA below includes additional information and suggested workarounds in the meantime:
Related information
Time-of-click feature information: docs.sophos.com/.../eg_EmailToCsummary.html
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[edited by: Sophos at 9:26 PM (GMT -8) on 28 Jan 2021]