Support filtering = false | ServiceProviderConfig
Azure AD SCIM client is not compatible with applications, which do not support "filtering".
If “filtering” is not supported by 3rd party app, do not ignore that.
Use the “matching” attribute defined in mappings during the initial cycle to check, if the resource exists.
If resource exists (HTTP-200), save “ID” persistently.
Use “ID” in every subsequent request
cf. RFC7644 section 4: https://tools.ietf.org/html/rfc7644#section-4