Do /buy, click on the buffer option and try. Done this from different computers and relogged and was able to replicate it.
I was able to replicate with the instruction @UnitedStates2 gave. Type /buy. Select a feature. I tried selecting a few different features in a few different categories and I got the same result. After you have selected a feature and it gives you the link. Type something into chat, which isn't a command, and the message "Type /{{ENABLE_CHAT_COMMAND}} to turn you chat back on." appears.
