We should be able to accept a calendar invitation forwarded (or really sent to us at all) regardless of if our ProtonMail email address is on the invite list.
I have friends and family that still use my Gmail account for calendar events. While I can get those events forwarded to my ProtonMail account, I can't add them to my ProtonCalendar without manually creating an event and copying the details over, since individual events can't even be imported.
We should be able to accept a calendar invitation forwarded (or really sent to us at all) regardless of if our ProtonMail email address is on the invite list.
I have friends and family that still use my Gmail account for calendar events. While I can get those events forwarded to my ProtonMail account, I can't add them to my ProtonCalendar without manually creating an event and copying the details over, since individual events can't even be imported.