Uber's right to operate in London has been extended by just two months as transport bosses have set further safety conditions for the ride-hailing app to meet before a new licence is granted.
Transport for London (TfL) refused to grant Uber a full five-year licence and ordered it to provide "additional material" when it submits its next application.
The firm's new temporary licence to operate in the capital is believed to be the shortest ever issued by TfL.
In June 2018, the company was granted a 15-month licence by a judge after it appealed against a TfL decision made the previous September not to renew its licence over safety and security concerns.
The concerns surrounded the company's approach to reporting serious criminal offences, how drivers' medical certificates were obtained, how criminal record checks were carried out and its use of technology which allegedly helped it evade law enforcement officials.
In a statement, TfL claimed its September 2017 decision led to Uber "improving its culture and governance".
It did not specify what "additional material" it has asked the firm to provide for its next application, but said it will "help inform any future licensing decision".
Uber's regional general manager for northern and eastern Europe, Jamie Heywood, said the firm will "continue to work closely with TfL" and provide "any additional requested information".
He added that a range of new safety features have been introduced to the Uber app in the past two years.
But Steve McNamara, general secretary of the Licensed Taxi Drivers' Association, which represents black cab drivers, said TfL's latest decision "clearly shows that the firm have failed their probation and are still a huge threat to public safety".
He continued: "The granting of the shortest operator's licence ever shows that the mayor doesn't trust Uber, and neither should Londoners."
The GMB union said Uber has had "more chances than a game of Monopoly" and claimed TfL had "simply kicked the can down the road".
It described the two-month extension as "no good for anyone" as it creates uncertainty for the 45,000 Uber drivers in London and allows the firm to continue to operate an "unsafe model on the streets of London".
Uber's short-term licence expires on November 24.
