Data range not recognized

Hi guys, i'm new here nice to meet you all!

I have on my report two data source: one for costs(directly from google ads) and the second from excel with conversions.

i merged this two data source in a blend with double keys(campaign and date)

However the problem is that the field date from the second data source on excel works well as a dimension(i see that in the table) but when i try to filter data with data range control it doesn't works.
It seems that looker studio doesn't recognize that field as date range even if the the manage added data source section i see it in ISO format and in date format.
Can you please help me with this?
Thanks, Marco




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