We have now the 4th generation of event-related actions in Power Automate but still, it is not straight forward to use them for a shared mailbox's calendar.
I hope this simple workaround will help you before we get a dedicated set of actions for shared mailboxes from Microsoft.
To be able to add, search, update, and delete events in the shared mailbox's calendar, follow these steps:
- If you have full access to the shared mailbox, open its calendar in the web browser.
You can use this URL and replace the e-mail of the shared mailbox given here as an example https://outlook.office.com/calendar/shared_mailbox@your.domain.com, - Use the Sharing permission option as shown below,
- Search your account and share the calendar with "Can edit" permission, as shown below,
- When you receive the invitation from your shared mailbox, please accept it,
- Now go back to your flow and use the connection to your account,
- Whenever you choose "Office 365 Outlook", event-related action, you can select the shared calendar.
And remember, this is just a workaround with all its drawbacks.
I hope this can help you.

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