The Austrian artist called it "disappointing" that the country is allowed to participate.
The singer's appearance in this year's contest has sparked pushback from protesters over Israel's inclusion in the contest.
The 24-year-old with no professional singing experience was the winner of the 11th season of Israel's "Rising Star" reality show.
The town in northern Switzerland's bid was helped thanks to 2024 entrant Nemo, who sang about gender identity journey in "The Code."
How the Swiss pop artist became a global star with their groundbreaking anthem to gender nonconformity, “The Code."
It was a battle between Croatia and Switzerland right to the very last moment.
Also making it into the final are Armenia, Austria, Estonia, Greece, Latvia, Netherlands & Norway.
Croatia, Cyprus, Finland, Lithuania, Portugal, Serbia, Slovenia & Ukraine also move past Tuesday's semifinal, while Australia, Azerbaijan, Iceland, Moldova & Poland are out.
Mayim Bialik, Helen Mirren, Scooter Braun, Selma Blair and more than 380 others also lent their names to open letter.
The 22-year-old singer is the first female artist to win the song contest in 10 years.
