Hi, your file contains a link or links to external files. On enable content, all values are replaced by errors (N/A). Difficult to help you out that way. Might be the reason why no-one reacted.
I detect perhaps this issue with the request: current chart is based on pivot. You cannot add a data series from another table.
One table is with user names, the other is not. The chart uses user names (x-axis). So how do envision the chart you are after? Common are the dates, not the user names. What would it show?
At first glance I doubt the actual data lay-out allows you to do what you are after. But I can be wrong obviously.
Perhaps you can make a new table, holding the dates, user names and some lookups to fetch the required values.
Make a chart on this table. And use a slicer on the table (possible in XL 13 and later). Table reacts on slicer, chart reacts on table thus chart reacts on slicer...
Isn't that what you are after?