What was the most significant moment in the history of Ted and Robin's professional lives on How I Met Your Mother?

Ted and Robin, the main characters of the TV series How I Met Your Mother, both had significant moments in their professional lives throughout the show. However, the most significant moment for them together was when they both got job offers from the same news station in Chicago.

This happened in the eighth season of the show, when Robin was working as a news anchor in New York and Ted was a professor of architecture. Ted was offered a job to design a new building in Chicago, and Robin was offered a job to be a co-anchor for the news station there. Initially, Ted refused the job offer because he didn't want to leave New York, but he eventually changed his mind and decided to move to Chicago.

This decision led to a major turning point in the series, as it was the first time that Ted and Robin's relationship started to break down. Ted was still in love with Robin at the time, but Robin had moved on and was engaged to Barney. Ted's decision to move to Chicago was seen as a desperate attempt to win Robin back, and it ultimately led to the end of their friendship for a period of time.