When did they take that subpoena to court to have it enforced?
It is just a figment of your pathetically screwed imagination.
The asked them to appear, the only subpoena that was issued was taken to court and the commies withdrew it.
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That's not true. Article 2 of the impeachment says this:
(1) Directing the White House to defy a lawful subpoena by withholding the production of documents sought therein by the Committees.
(2) Directing other Executive Branch agencies and offices to defy lawful subpoenas and withhold the production of documents and records from the Committees — in response to which the Department of State, Office of Management and Budget, Department of Energy, and Department of Defense refused to produce a single document or record.
(3) Directing current and former Executive Branch officials not to cooperate with the Committees — in response to which nine Administration officials defied subpoenas for testimony, namely John Michael “Mick” Mulvaney, Robert B. Blair, John A. Eisenberg, Michael Ellis, Preston Wells Griffith, Russell T. Vought, Michael Duffey, Brian McCormack, and T. Ulrich Brechbuhl.