Solution
Yes, the NI Ettus USRP X440 is not compatible with LabVIEW and is only compatible with UHD at the moment. However, user can use LabVIEW by calling into UHD's Python API, but that's not something that NI is officially supporting.
For further roadmap on X440 with LabVIEW, please do contact your account manager, sales or send a request support ticket to NI at
Support-NI .