Reply To: vertical strokes in table

Have you set your keyboard shortcuts to a none standard set???

To select the whole table move your cursor to the top right hand corner of the table until to changes to a 45º angle arrow, then click. DO the same to above a column or beside a row and the arrow will point down or right, click to select or click and drag to select multiple rows or columns.

Once selected use the shortcut (it does work) or use the Cell Style from the Table Menu
The you can apply the format you want.

Or read the Adobe tutorial for Table Formatting.
https://helpx.adobe.com/au/indesign/using/formatting-tables.html