Logged in, added two keys, went to immediately sell. Hit with
"Inventory bot trade banned by Steam
The bot owned this item has been trade banned by Steam. "
I *just* sent these keys over?

From the shop log, you deposited 2 keys into key credit, and there's nothing in your shop inventory to be sold. I can't really understand what problem you encountered.

You have a free anonymous account which you cannot sell any currency items and Steam games.