Unable to get Write permissions on a SharePoint Calendar synced with Outlook

Hi!

I've made a SharePoint Calendar in a site I own. When I try to sync that calendar to Outlook (In order to copy events from anther calendars and have them sync with the SharePoint Calendar) I only get READ permissions.

If I edit in the SharePoint site i can create event without any issue, but I've tried deleting and sync again and or even with multiple O365 accounts and I have been unable to get write permissions.

Do anyone know how to proceed?

Thanks.