[Python] how to pass several variables in for a pandas groupby

This code works:

cohort = r'priority'
result2025 = df.groupby([cohort],as_index=False).agg({'resolvetime': ['count','mean']})


and this code works

cohort = r'impactedservice'
result2025 = df.groupby([cohort],as_index=False).agg({'resolvetime': ['count','mean']})


and this code works

result2025 = df.groupby(['impactedservice','priority'],as_index=False).agg({'resolvetime': ['count','mean']})


but what is not working for me is defining the cohort variable to be

cohort = r'impactedservice,priority' # a double-cohort
result2025 = df.groupby([cohort],as_index=False).agg({'resolvetime': ['count','mean']})


That gives error:

KeyError: 'impactedservice,priority'


How to properly define the cohort variable in this case?

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