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5.2. Can't add Exchange / Outlook calendar

Some organisations might set restrictions for using third-party services. You can contact the IT administrator at your organization to ask whether it's possible to use your account in Calendars.

If the access is allowed by your organisation and you are still experiencing issues adding your Exchange / Outlook account to Calendars, there might be the following reasons:

• The Internet connection on your device is unstable. With poor connection, Calendars might not be able to add your account.
• VPN is enabled on your device. If you use a VPN, we can’t guarantee Calendars will work properly. The quality of the performance via VPN solely relies on the servers of the VPN network. For this reason, we recommend you turn the VPN off.

If you have 2-factor authentication enabled or the administrator can't give you access to use Calendars, you can add your account through local calendars. Please note that color-coding will be random for accounts added this way. 

1. Add the needed calendar to the local Calendars app first.
2. Open Calendars by Reaadle.
3. Press ⌘, > Local Calendars. Alternatively, click Calendars in the Menu Bar at the top, then select Settings > Local Calendars.
4. Enable the display Local Calendars toggle and choose the accounts to display. That’s it!

Note: If you already have some of the accounts added to Calendars by Readdle and don’t want them to be added twice to the app, disable them in the Local Calendars section of Settings (⌘,). Disabled accounts will still be available for other apps and systems.

Tip: To learn how to add multiple accounts to Calendars on your iPhone or iPad, check out this article.