Managing meetings and events using Outlook on the web for business
Hello Marcel Hodan,
Thank you for posting in the Microsoft Community. We are happy to help you.
I understand that you are experiencing an issue with subscribing to a shared Outlook calendar using an ICS link. Based on the information you provided, it seems that only a subset of calendar entries are visible in the new calendar after subscribing to the ICS link. However, all existing calendar entries are visible when you open the HTML link.
One possible reason for this issue is that the HTML link and the ICS link may have different data. The HTML link may be showing the most up-to-date version of the calendar, while the ICS link may not have been updated with the latest changes.
To resolve this issue, I suggest that you try to refresh the ICS link by generating a new one from Account A and then subscribing to it again from Account B. You can also try to manually add the missing calendar entries to the new calendar in Account B.
If the issue persists, please let me know and I will be happy to assist you further.
Sincerely
Simbarashe | Microsoft Community Moderator