Some visualization types will allow you to add multiple columns to a tool tip, and others, like the map chart, will not. The dialog will look like this (see below), where you can only add one column to the label.
The solution to this problem is to right click on the Label by selector and select custom expression. Then, use the UniqueConcatenate aggregation to combine columns of information. Use the "&" symbol to combine columns. Use quotation marks for any texts or spacing.
Here is a sample of the output.
