Fixing Graph API: unknown - subscription_error: M365::ManagementClient - 400 Bad Request

For manually mapped tenants 

Please approve the app using; https://login.microsoftonline.com/common/adminconsent?client_id=3a8b631c-cbce-4c51-a5af-1d3bc0a14d69 with a different global admin other than the Huntress one, then delete the integration and re-map.

For CSP Tenants

For CSP tenants (not manually mapped) this error means one of two things AADSTS65001 or AADSTS50020 please follow the guides for each and then wait up to 24 hours for data to start flowing.