1. Make sure that the necessary guest account is invited to your Azure Active Directory tenant and it has the necessary role allocated. This can be done in https://portal.azure.com/#blade/Microsoft_AAD_IAM/UsersManagementMenuBlade/AllUsers.
2. Check if the necessary applications are consented with correct permissions.This can be done in https://portal.azure.com/#blade/Microsoft_AAD_IAM/StartboardApplicationsMenuBlade/AllApps/menuId/.
Centero Azure AD Connector:
CSM for Intune:
3. Confirm your tenant name from Microsoft Intune https://portal.azure.com/#blade/Microsoft_Intune_DeviceSettings/ExtensionLandingBlade/tenantStatus.