Hi TobbenDK,
Thank you for sharing your update with us.
As per your mentioned description about “because the added calender is not merged with my primary calender”, generally there are two method for adding calendar:
- Import a calendar into Outlook and
- Subscribe a calendar into Outlook.
So, regarding your mentioned reply, at once we would like to suggest you that you may try to import a calendar into Outlook. Here are some detailed steps and official information articles for achieving calendar related thing into Outlook.
1. You can't add an Internet calendar in Outlook 2016, Outlook 2019 and Outlook for Office 365
2. Import or subscribe to a calendar in Outlook on the web
For using google calendar into Outlook, here is the detailed information article for the reference purpose: See your Google Calendar in Outlook
Note: The imported calendar is a static snapshot. To update it, you need to subscribe to it or repeat this procedure to import a copy of the most current version of your calendar.
Hopefully above mentioned information will provide you some suitable thing for your concern requirement.
Regards,
Darpan