Call2Teams relies on a high-degree of automation to provision the service into Office 365 and to manage the service with the Sync Now feature.
The process below outlines the test a customer can perform to verify the presence of the Application Programming Interfaces (APIs) required in their Office 365 tenant.
Where the API is not found, then Microsoft should be notified as this demonstrates a provisioning issue with the build of the Office 365 tenant that Microsoft need to resolve.
Log in to the Microsoft 365 admin center using credentials with Global Admin privileges
Click Show All on the menu
Open Azure Active Directory
In the Active Directory Admin Center click on Azure Active Directory
In the Overview menu click on App Registrations
Click to create New Registration
Give the App a Name (not important)
Select option for Accounts in any organizational directory (Any Azure AD directory - Multitenant)
For your created app select API Permissions
Then select Add a Permission
Request permission for the API by
Select API my organization uses
The search box needs this GUID to be pasted in: 39624784-6cbe-4a60-afbe-9f46d10fdb27
If you receive the result 'No Results' then the API is absent in your Microsoft tenant
On a good tenant the result below will re returned: