As per comment, this worked for me:
Edit /opt/splunk/etc/apps/TA-MS_O365_Reporting/bin/input_module_ms_o365_message_trace.py
Manually set query_window_size and delay_throttle like so:
def validate_input(helper, definition):
input_mode = definition.parameters.get('input_mode')
interval = definition.parameters.get('interval')
query_window_size = 60
delay_throttle = 1440
# query_window_size = definition.parameters.get('query_window_size', None)
# delay_throttle = definition.parameters.get('delay_throttle', None)
start_date_time = definition.parameters.get('start_date_time', None)
end_date_time = definition.parameters.get('end_date_time', None)
start = None # Local instance of start date
end = None # Local instance of end date
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