Enabling Large models in Premium capactiy

To add to this, I ran Resolve-PowerBIError...

RequestId : f8ec7aeb-7350-4798-9f70-d81cbe09d459
Response : Bad Request (400): {"error":{"code":"InvalidRequest","message":"Invalid dataset. Premium Files is
not available for this dataset."}}
PowerBIErrorInfo :
ResponseDate : Wed, 22 Jan 2020 01:36:11 GMT
RequestMethod : PATCH
RequestUri : https://api.powerbi.com/v1.0/myorg/datasets/2d3e0a25-e6d5-4587-b0b4-48e4d8a3820e
InvocationInfo : {Set-PowerBIDataset}
Line : Set-PowerBIDataset -Id 2d3e0a25-e6d5-4587-b0b4-48e4d8a3820e -TargetStorageMode PremiumFiles
Position : At line:1 char:1
+ Set-PowerBIDataset -Id 2d3e0a25-e6d5-4587-b0b4-48e4d8a3820e -TargetSt ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
StackTrace : at Microsoft.PowerBI.Api.V2.Datasets.<UpdateDatasetByIdWithHttpMessagesAsync>d__13.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.PowerBI.Api.V2.DatasetsExtensions.<UpdateDatasetByIdAsync>d__81.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.PowerBI.Api.V2.DatasetsExtensions.UpdateDatasetById(IDatasets operations, String
datasetKey, UpdateDatasetRequest updateDatasetRequest)
at Microsoft.PowerBI.Common.Api.Datasets.DatasetsClient.PatchDataset(Guid datasetId,
PatchDatasetRequest patchDatasetRequest, Nullable`1 workspaceId)
at Microsoft.PowerBI.Commands.Data.SetPowerBIDataset.ExecuteCmdlet()
at Microsoft.PowerBI.Commands.Common.PowerBICmdlet.ProcessRecord()
HistoryId : 18

... which gave me more insight on the 400 error... "Invalid dataset. Premium Files is
not available for this dataset."

I am wondering what is missing in the *.pbix file? I have premium capacity set on my workspace and incremental refresh enabled with the right parameters. I have confirmed incremental refresh is working with a smaller amount of data.