Accepted invites never get populated in calendar

I am running my own domain at one.com who offers both email and caldav services and I’m about to migrate away from running Apple Mail and Apple Calendar to EmClient instead, both on computer and phone.

On my computer I have configured two accounts in EMClient, one caldav and one email. For the email account I have configured the standard folders for calendar, tasks and contacts to the folders from the caldav account and everything seems to work fine.I get an invite in the mailbox, I accept it and it pop ups in my calendar on both laptop, phone and at the web calendar as expected.

I exported all eMClient configuration using QR-code to my phone and expected it to work in the same way but no. Any calendar invites I accept on the phone never gets populated in the calendar, not in my caldav, not even in the local calendar,on the phone they just dissappear…so what I am missing here!??

Running version 10.4.5326 (97a2e75) on computer and 10.4.5360 on my iPhone.