This message will appear when User Consent Permissions have not been configured to allow a user to give consent for applications to access their mailbox.
This is due to your organization deactivating the ability for users to consent access to company data on their behalf.
In this scenario, an Outlook365 admin user will first need to set up the integration on their Findem account. When the admin user is prompted with the OAuth2 grant screen, you will need to ensure the box for Consent on behalf of your organization is checked.
Moving forward, other users will be allowed to set up their own Outlook365 integrations in Findem.
If your admin doesn't have Findem account. They need to enable admin consent workflow to allow users to request an administrator's review and approval while integrating Findem with their Outlook365 accounts.
Once enabled, each user would be able to directly request approval from the admin during setting up their Outlook365 integration. A user's request form would look like this:
The request is sent via email to admins who have been designated as reviewers. A reviewer takes action on the request, and the user is notified of the action.
Further information about the admin consent workflow can be found on Microsoft's website here: