The team of U.S. officials negotiating with Iran over its nuclear program has not updated Israel on developments in nearly two weeks.

Both Israeli and U.S. officials acknowledged Tuesday that there has been a failure in communication between the two countries, but differed on the reasons why.

According to senior U.S. officials, Under Secretary of State for Political Affairs Wendy Sherman, who is leading the U.S. in the talks, tried to contact Israel's National Security Adviser Yossi Cohen three times over the past ten days. But the U.S. says scheduling conflicts prevented the calls from going through.

According to senior Israeli officials, the last confirmed update from Sherman took place 12 days ago. Those officials insisted that "we have not declined any offers for further updates."

Israeli Prime Minister Benjamin Netanyahu has not spoken once with Secretary of State John Kerry since the latest round of nuclear talks began in Vienna, Haaretz reported. Netanyahu has been one of the loudest critics of the Iran talks.

Because of the poor communication between the U.S. and Israel, Israeli officials have only a "partial understanding" of what is happening at the negotiating table between Iran and the so-called P5+1 nations — the U.S., Britain, France, Russia, China and Germany.

The deadline to reach a long-term comprehensive nuclear deal was extended Tuesday. It is the latest one to have been missed and extended since an intermix deal was reached in November 2013.

(h/t Times of Israel)