Question: why are the olsen twins not joining fuller house?
Answer: In 2016, executive producer Bob Boyett explained why the Olsen twins didn't want to reprise her role. "Ashley said, 'I have not been in front of a camera since I was 17, and I don't feel comfortable acting,'" he told People. "Mary-Kate said, 'It would have to be me because Ash doesn't want to do it.