Sharepoint OWNER can add calendar events. Other permission levels can’t add even with Edit level access.

I am on the newest version of Sharepoint that is still rolling out to users over the next couple of months so this question might be hard to answer.

One of the new features in Sharepoint is an “Events” WebPart that you can add to any of the “modern” pages. This Events webpart links to a calendar on the site. On the modern page the events webpart looks like a list of up coming events and has an “Add Event” button for users with the right permissions. My OWNER permissions level user can add events no problem. My Edit permissions level user can click the Add Event Button but then gets an error that says…
We’re sorry, we encountered an unexpected error. Please try again, if the problem persists please contact your Administrator.
PageLayoutId – Event
However, if the user with Edit permissions goes to the actual calendar (not using the Events webpart) they can add an event the old fashion way from the ribbon without errors.

Any help would be greatly appreciated!

P.S. I even tried giving that user FULL CONTROL permission just for that one calendar list and still getting the error.