Categories in Group Calendars

Hi all

We use group/team site calendars heavily within our organisation and departments. Up until recently, users have been able to tag/categorise calendar entries within group calendars that they are a member of. In addition, each calendar could have its own set of tags. I.e. "Accounts Department" calendar could have tags set for Meeting, Payment Due, Contract End etc, and "Sales Department" could have tags on their calendar for Client Call-back, Sales Visit, Training etc.

This has all been done via Outlook Online (Tags still seem to work fine from Outlook 2016 / Outlook for Mac) so I assume this is an update issue.

However, this all disappeared over the past few days. If a user now goes into and existing entry in a shared calendar, the existing tag shows but there is no options to change it or remove it. If creating a new entry, the option just isn't there at all. It is only visible on user's personal calendars!

Is anyone else experiencing this, or have any suggestions of a work around?

Many thanks!

Andy