Was told I could apply for an internal position 2 months ago and now I’m not considered for it

I work for a trucking company and they were going to switch me from office stuff and into a sales position. For the last month and a half, almost 2 months, they have had me doing sales calls and setting up meetings for the person in the position I would be applying for. I was told today that I am no longer considered for this position and that I need to keep working hard and in around 2 years I might be able to move into it.