What happened the last time US, Iran held talks in Oman?

This is not the first time Iranian and US officials have met in a bid to revive diplomacy between the two nations, which have not had official diplomatic relations since 1980. In June last year, US and Iranian officials gathered in the Omani capital to discuss a nuclear agreement, but the process stalled as Israel launched attacks on Iran. The US later briefly joined the war, bombing several Iranian nuclear sites.