Dataflow Parameters not resolving when created from New Query

Hi adamlob ,

Thank you for contacting the Microsoft Fabric community forum.

Microsoft documentation describes Dataflow Gen2 parameters as values created and managed through the Manage Parameters experience in Power Query. These parameters support configurable input scenarios and include metadata such as data type, required configuration, and suggested values.

Queries created through New Query are standard Power Query queries and are not documented as Dataflow parameter objects.

As a supported approach, Microsoft documentation recommends using the parameter management experience when implementing parameterized Dataflow scenarios.

Please go through the below documents for the reference:

Use public parameters in Dataflow Gen2 – Microsoft Fabric

Parameters in Power Query (Microsoft Learn) 
Parameterized Dataflow Gen2 – Microsoft Fabric

If I misunderstand your needs or you still have problems on it, please feel free to let us know. 

Best Regards, 
Community Support Team