When I try to use speech in Bing Translator modern app on Surface 2, I get a message "We can't access the network right now". I am connected to a network and have access to the internet.
This issue may be related to this one somehow:
...or it may be not :-).
I am in the Czech Republic, my Surface was bought in the UK, but then the system display language was changed to English (United States). The region is Czech Republic. Additional languages installed: Czech.
Camera translation works well, text translation too.