I'm working in Pro 2.8. For text boxes, the vertical option appears greyed out to me (possibly until they get it fixed?)
I'm working with a table frame, and would like to apply vertical alignment to both heading text and data text. So would prefer to have all these items aligned vertical center, or even vertical bottom (this is the table header):

Vertical alignment buttons (not greyed out) have no effect whatever. I've tried selecting the whole table, just heading text, just data text, a single field, etc. etc. Nothing. Closed and restarted and all the usual stuff, nothing.
It's not a show-stopper, but whenever this makes it to the priority list, there are those of us who will appreciate it.