dimension content_provider_breakdown and day returns error 400

Hi,

i'm trying to filter the campaign-summary of content_provider_breakdown and day with the following query params:

1 - country (example start_date=2021-07-06&end_date=2021-07-12&country=HK), this works.
2 - platform (example start_date=2021-07-06&end_date=2021-07-12&platform=PHON), this works.
3 - but if I try with both (example start_date=2021-07-06&end_date=2021-07-12&platform=PHON&country=HK), gets error 400.

what should i do with the 3rd example?

thanks in advance.