You can connect an external calendar via CalDav.
Note that though connected external calendar events will appear in your Bitrix24, the event reminders will not.
Go to the Calendar section and click the Connect calendar button. If you already have external calendars connected, this button will say Synchronize.
Click the Connect other calendars button and select External Calendar.
Enter the following details:
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Name: Specify the calendar name to display in the list.
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Calendar server address: Go to the external calendar settings, copy the link for CalDAV, and paste it into this field.
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Login: Enter your email account address.
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Password: Enter the password for your account.
Click Connect.
If everything is correct, the calendar list will show the external calendar connected.
If you've entered your data correctly but still face an error, you may need to create an application password on the external calendar page and enter it in the Password field. Make sure to review the third-party service's security policy before syncing.