I can't add new events to my icloud calendar on Mac, but they DO show up on my phone.
Why can't I add new events to my iCloud calendar on Mac? They DO show up on my iPhone, though...
iMac 21.5″, macOS 10.15
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May be Mac is not signed with Apple ID and password so cross check the settings to get it signed in https://support.apple.com/en-us/HT204053
And add calendar account in Mac https://support.apple.com/guide/calendar/add-or-delete-calendar-accounts-icl4308d6701/mac
If you create an event in iCloud.com https://support.apple.com/guide/icloud/create-events-mmfbbb32be/icloud
The same event will be reflected in Mac calendar application , when calendar account is configured then also an event can be created directly from Mac calendar application https://support.apple.com/en-in/guide/calendar/icalwr13-events/11.0/mac/10.15
And in your iPhone as you have signed a different Apple ID and password , set up iCloud https://support.apple.com/en-in/HT208681
And turned on calendar box https://support.apple.com/en-us/HT207689
And that's the reason the events are created https://support.apple.com/guide/iphone/create-and-edit-events-iph3d110f84/ios