Scheduling and managing events using Outlook.com calendar
Hi James,
Thank you for the update. You can try this alternative steps.
Confirm if this is a known issue: Check the Microsoft 365 Service Health Dashboard or the Microsoft Feedback Portal for reports related to calendar publishing.
Submit feedback: Use Help > Feedback > Report a Problem in Outlook or post on the Feedback Portal. Include screenshots and note that this worked previously but broke after recent updates.
Alternative sharing options:
Use Share Calendar with specific people and set permissions to “Can view all details.”
Or export the calendar to an ICS file and share that link instead of HTML.
Monitor updates: Microsoft often rolls out fixes for regressions like this in subsequent updates.
I hope this helps.
Best Regards, Noel