I'm trying to share a calendar with my partner, and she is attempting to do likewise with me.
The first issue is that when sharing a calendar you do not get to select a permissions level, which has to be amended after it has been shared from the default or read/write to view only. There's no fix for this that I know of, it's just annoying and worth a feature request.
The second issue which is more annoying is that the permissions level for either calendar is reverting back to read/write no matter how many times I ask it to use view only.
I've attempted to change from iPhone/iMac and Web, and the same issue each time.
I've removed sharing access full stop and then re-shared the calendars, no luck.
I do have a shared calendar with someone else that has stayed in view only, but that was shared ages ago so I don't know what I might have done differently then.
Any clues what to do to fix this?