Eeyore is not in this movie. When Christopher Robin goes off to college the Pooh characters become feral because there is no one to feed them. Subsequently they chow down on Eeyore. His tombstone is in the movie.
(The reason is the rights to his character have not became available in the public domain)
Eeyore is public domain, which is why they mention him by name in the movie. It’s Tigger who is still under copyright.