Is there a way to integrate Zoom to iOS calendar / Mail app when using private domain e-mail?

Same here. I do not understand why there is no integration with iCal. If I need to use Outlook, I can use Teams (for free when you are forced to have Office365) and do not need Zoom. 

Exactly, the only solution I've figured out is to download the iCal file when I schedule a meeting from web, add the invitees to the invitation in Apple Cal and send it out. It works, however a tech company like Zoom should be able offer the same effortless calendar integration to all 'mainstream (iOS)' users. 

Agreed, but this is no option for me. I expect from a tool to safe not consume time.

Exactly. I use Apple products, I.E.mail and calendar. Why does Zoom not provide integration with Apple products like it does Google and Microsoft. I have no use for Zoom's mail or calendar apps if they do not integrate with Apple's mail and calendar. It's a waste of my time and production. The only time I use Zoom now is to attend meetings that someone else has scheduled. I cannot use it for any other purpose.