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Python Python Collections (2016, retired 2019) Dictionaries Teacher Stats

Any reason why my most_courses function wont pass?

took a couple of days but i finally got it to do what i need it to do.....i ran it through my repl increasing and decreasing number of classes in the dictionary and i get the correct result...it returns the name of the teacher with most courses..

cant figure why it wont pass anh hints?

teachers.py
# The dictionary will look something like:
# {'Andrew Chalkley': ['jQuery Basics', 'Node.js Basics'],
#  'Kenneth Love': ['Python Basics', 'Python Collections']}
#
# Each key will be a Teacher and the value will be a list of courses.
#
# Your code goes below here.

def num_teachers(a_dict):
    return len(a_dict.keys())

def num_courses(a_dict):
    count = 0
    for teacher in a_dict:
        count += len(a_dict[teacher])
    return count    


def courses(a_dict):
    new = []
    for key,value in a_dict.items():
        for values in a_dict[key]:
            new.append(values)
    return new  

def most_courses(a_dict):
    max_count = 0
    name = None
    for teachers,classes in a_dict.items():
        if len(classes) > max_count:
            max_count = len(classes)
            if len(a_dict[teachers]) == max_count:
                name = teachers
    return name