Hey, I use Notion Calendar. It only uses Google accounts for the time being. However, under your main google account you can add by url and use the iCal url for your titan calendar.

It works, kind of. It is a one-way read-only connection that takes so long to update that you may not see it until the next day in Notion (or Google, or anything else that uses the iCal links.)

I've asked for real-time two-way calendar sync that at minimum can be added to a Google Calendar. I'm not so sure they will get there soon. They cannot even figure out why their CalDav stuff doesn't work 99.9% of the time.

Titan, don't ask me to submit a ticked about CalDav. Been there and tried that for WEEKS. I'm a CTO with nearly 30 years in software engineering. It's not a user error.