Missing SharePoint data fields

I am having a problem. I connected my to my SharePoint online site as my data source. I picked the lists that I wanted as my tables. I started creating custom columns and Measures, only to discover one of my fields 'Project Due Date' was missing. I went to the Edit Query, and found the column in the 'FieldValuesAsText' and I added the missing field. However, I cannot use this field for anything. I does not show up ion the list to use in any customer column, formula, or measure.

What am I doing wrong?