Yes I've tried to reset it 5 times! I even tried it on an apple device! It gets connected and it works but it never shows up on any devices! I always have it connected with my laptop, but now when I click the Cortana icon and then devices my invoke never shows up! But it will show up if I want to connect to bluetooth under the bluetooth settings. Its driving me mad. I usually have my invoke make a sound when it is listening to me speak, and that can be done under settings. But now I can't do that anymore!
First things first you are not alone. I have two invokes and. Ith are working but they do not show up in the cortana app not on pc or android so it's not your device it's Microsoft. I would of suggested doing the pIn in hone reset but let's wait it out and see what Microsoft says