U.K. fintech Revolut has hit yet another roadblock to its longstanding mission of becoming a real bank in its home country: Its full banking license is on hold because the country’s central bank is concerned over whether the startup can maintain its risk management controls in the face of its blazing fast international expansion.

The Bank of England wants Revolut to commit to building its risk management stack to match its international growth before the regulator can approve a full banking license, while the Prudential Regulation Authority is investigating the fintech’s controls in the U.K. and internationally, according to the Financial Times.

Revolut got approval to receive a banking license in the U.K. more than a year ago , but is still in the so-called “ mobilization ” stage.

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