Checking Permissions for Office 365 Exchange Online API

To check Office 365 Exchange Online API permissions, do the following:

1. Sign in to the Microsoft Entra admin center.
2. Go to Entra ID > App registrations, and select an application.
3. In the Manage section, select API permissions.
4. In the Configured permissions section, check the permissions granted for the Office 365 Exchange Online API against the permissions listed in Permissions for Modern App-Only Authentication.
5. If you want to add a missing permission, do the following:

1. Click Add a permission > APIs my organization uses, and then select Office 365 Exchange Online in the list.
2. Select the required permissions and click Add permissions.
3. Click Grant admin consent for <tenant_name> and confirm the operation.