fortnune doesnt work

 Have this same issue and was going to report it too.

I came to do the exact thing, I used a fortune 2 iron pickaxe to mine 10 diamonds and only got 10 diamonds in return. 

Same here, its annoying beyond belief.

Thank you for your report!
We're actually already tracking this issue under MCPE-67169 so I've requested this report be resolved and linked as a duplicate.

If you would like to add a vote and any extra information to the main ticket it would be appreciated.

If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.

Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki