In a new CinemaBlend interview, released very early to the public, Daniel Espinosa; the director for Morbius, has finally confirmed which universe the movie is set in.
After all of this confusion surrounding the trailers for 2 years, showing references to many universes. Morbius is finally set in the Venom-verse. The storyline takes place between Venom Let There Be Carnage and Spider-Man No Way Home.
Daniel also confirms the credit scene details that were leaked about Michael Keaton’s Vulture being kept only for the credits, appearing in the cells after being transported from the MCU to the Venom-verse.
In a second credit scene, Vulture appears in a new suit, recruiting Morbius for a team-up to seek revenge on Spider-Man.
There is also a Spider-Man set in this universe, however the director does not mention which that is.
See the full CinemaBlend interview thread here:
Sony Pictures has also encouraged these spoilers being shared out already, a week before the movie is released to the public.