Can't sync calendar on my

I have just installed AkrutoSync, because I want to try it out.
I have a Huawei P10 Plus mobile phone with Android 7.0.
On my computer I am running Office 365.
While I got AkrutoSync to sync my contacts both ways, between the phone and computer and vice versa, my calendar only syncs from the phone to outlook but it not from outlook to my phone.
What am I doing wrong?