The Vatican has declined to comment on reports that it has not accepted a new French ambassador because he is gay.
The French government proposed the senior diplomat Laurent Stefanini for the post in January.
It normally takes about a month for an appointment to be approved, but three months on the Vatican has kept a diplomatic silence.
Media reports in France say the French government is refusing to back down over the appointment.
In 2007, France proposed an openly gay diplomat to be its ambassador at the Vatican but was forced to choose another after months of silence.
The French Catholic newspaper La Croix reports that the Vatican has indicated the posting is unacceptable.