I followed these instructions for importing my Google Calendar into Outlook 2019 as an "Internet Calendar". The calendar now shows up in Outlook under "My Calendars", and if I accept a meeting request from an Outlook email then the meeting gets added as an event in the Outlook calendar. However, if I try to manually add my own event to the calendar, it errors saying that it's read-only:
Similarly, if I edit an existing event (added from an email meeting request) and try to change anything such as setting a reminder, it gives another error about reminders not being supported and asking if it's OK (it's not OK...)
What do I need to do to get my Google Calendar syncing properly with Outlook, so that I can add and make changes to events?