Connect to multiple calendars

roumen92,

please try to change permissions on calendars to which you would like to connect. Add your account i.e. as Editor.

you can also find some detail about calendar sharing here: https://support.office.com/en-za/article/Sharing-your-calendar-in-Outlook-Web-App-7ecef8ae-139c-40d9-bae2-a23977ee58d5#__toc375064922

1. Each user from which you would like to collect data should change permissions

2. So, you have to right click on specific calendar and select permissions option from context menu.

3. Setup appropriate permision level for each calendar. Add your account i.e. as Editor