The reason for Ridley Scott not signing Vangelis for the soundtrack of Blade Runner 2049 is not well documented. However, it is known that Hans Zimmer and Benjamin Wallfisch were chosen to compose the score for the sequel.
It is possible that Scott had different musical visions for the two films and chose to work with different composers. It is also possible that the rights to the original Blade Runner soundtrack, which was composed by Vangelis, were not available or too costly to secure.
Regardless of the reasons, the decision to bring in new composers for Blade Runner 2049 was met with mixed reactions from fans of the original film. Some appreciated the new musical direction, while others felt that Vangelis’ distinctive style was an integral part of the Blade Runner universe and should have been included in the sequel.
In conclusion, the exact reason why Ridley Scott did not sign Vangelis for the soundtrack of Blade Runner 2049 is not known. It is possible that it was due to different musical visions, availability of rights, or financial reasons. Regardless, the decision was met with mixed reactions from fans.