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As you've found out table calculation filters can't be used across worksheets on a dashboard. You can use a parameter calculation where the user would select the parameter and something like LOOKUP(MIN([Customer]),0) = [myParameterValue] is on the Filters Shelf, filtering for True. However parameters are single select and require manual updates if you are adding or removing values, so they don't always work.,
Another option that at least gets dynamic updates would be to use a data blend to fake a "dynamic" parameter, I wrote about this in Creating a Dynamic “Parameter” with a Tableau Data Blend | Drawing with Numbers , the calc in that case would be something like LOOKUP(MIN([Customer]),0) = ATTR([secondary source].[customer]). Again this would only be single-select.