"Unclear expectations" means that it is not clear or easily understood what someone expects or wants from a particular situation or task. Full definition
It's a time of unclear expectations, communication preferences, and management styles. (sciencemag.org)
But when people have to work with unclear expectations, with tools and resources that don't work well, training won't fix those problems. (elearningindustry.com)
When children are adjusting to a new step parent, they can be confused by unclear expectations. (thriveworks.com)