Using a thermostat list in POST Issue Demand Response

I might need to use a thermostat list instead of a managementSet selection in a demand response. I know that for GETS, the thermostat list is limited to 25 devices.

Is it also limited to 25 thermostats for a demand response call? The documentation seems to say the limit is 25 no matter what kind of call it is.

Maybe this is why I'm having trouble using the managementSet selection if the group has more than 25 thermostats. Is Ecobee converting the managementSet to a list of thermostats and giving an error when it's more than 25?

I know the event gets converted to a list of thermostats because I see the list when I do GET List Demand Response. The hierarchy group is no longer shown.
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