Approving Calio for your Microsoft 365 organisation

Is an employee seeing an “Approval required” screen when connecting their calendar? That is not down to Calio or to the employee: your Microsoft tenant is configured so that users may not approve calendar access themselves. An administrator approves Calio once, and after that everyone can connect without this screen.

What Calio asks for, and why

Permission	As Microsoft shows it	What Calio uses it for
`Calendars.ReadWrite`	Have full access to user calendars	Read busy times so Calio never offers a slot you are already booked for, and write a confirmed booking into the calendar (removing it again on cancellation).
`User.Read`	Sign in and read user profile	The email address of the connected account, so the employee can see in Calio which calendar is attached.
`offline_access`	Maintain access to data you have given it access to	Keeps the connection working without the employee signing in again every hour. Access stops the moment the connection or the approval is revoked.

“Full access to user calendars” sounds broader than what Calio does. Microsoft has no separate permission for “only see free/busy and add your own events”; to be able to write a booking into a calendar, this is the narrowest permission that exists. When reading, Calio only requests the start, the end and the busy status — no titles, attendees or contents of events. Calio only writes appointments booked through Calio and never touches existing events. See the privacy policy and the data processing agreement.

Are you the admin? Approve it here

You sign in with your Microsoft administrator account and see exactly the list above. One click, and it applies to the whole organisation. This does not connect any calendar and does not release any data: every employee still connects their own calendar afterwards, and can disconnect it again themselves.

Approve Calio for my organisation

Do you use Calio yourself as well? Then you can instead approve and connect your own calendar in one step.

Prefer to do it manually? In the Microsoft Entra admin centre go to Enterprise applications → Calio and grant admin consent there. The application ID is 5165b90f-d90d-474e-9134-4eed504d365a (publisher: Omegaform, domain calio.nl).

Want a broader fix: under Enterprise applications → Consent and permissions you can add Calendars.ReadWrite to the permissions users may approve themselves. That applies to every app, so approving per app is the narrower choice.

Not the admin? Forward this

Email your IT administrator the text below — it contains everything they need.

Subject: approving Calio for our Microsoft 365 environment

Hi,

I would like to connect my Outlook calendar to Calio, our scheduling tool. Microsoft first asks for approval from an administrator. At https://calio.nl/en/microsoft-approval you can see which permissions those are (reading the calendar and adding appointments), what they are used for, and there is a button to approve it for our organisation in one click. No calendar is read until an employee connects one themselves.

Could you do that? Thanks!

Questions, or stuck? support@calio.nl · Back to the Microsoft 365 integration