Power Automate Run Query Against a Dataset Syntax?

I am trying to get Power Automate to generate an output from a query against a Power BI dataset. With a test dataset containing a table named StaffingRequest, I have tried:

Table.SelectRows(StaffingRequest, each [CC_Check_Firm_Offer_Due] = "Firm offer overdue")

and also

EVALUATE Table.SelectRows(StaffingRequest, each [CC_Check_Firm_Offer_Due] = "Firm offer overdue")

I keep getting error messages like:

{"error":{"code":"DatasetExecuteQueriesError","pbi.error":{"code":"DatasetExecuteQueriesError","parameters":{},"details":[{"code":"DetailsMessage","detail":{"type":1,"value":"Query (1, 10) The syntax for 'Table' is incorrect. (EVALUATE Table.SelectRows(StaffingRequest, each [CC_Check_Firm_Offer_Due] = \"Firm offer overdue\")\n)."}},{"code":"AnalysisServicesErrorCode","detail":{"type":1,"value":"3238920194"}}]}}}

I know the syntax for the Table.SelectRows function is correct as I have tested it in Power BI using the last applied step in place of the table name, and it works fine:

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WcsssylXIT0tLLVLIL0stSilNVYrVwS4cCwA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [CC_Check_Firm_Offer_Due = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"CC_Check_Firm_Offer_Due", type text}}),
    #"SelectRows" = Table.SelectRows(#"Changed Type", each [CC_Check_Firm_Offer_Due] = "Firm offer overdue")
in
    #"SelectRows"

What is missing???