Why am I no longer receiving lingots for my 10 day streaks?
Yes, use the web (or iOS) version every tenth day and complete your daily goal. Then immediately bring up the Android app and receive 1-5 additional lingots. Eventually you will claw back all the lingots you were ripped off. Apparently Duolingo chose to single out Android users as unworthy of streak rewards.
Hmm, it's starting to seem like a glitch to everyone. Many people yesterday have said the same thing on why they aren't receiving lingots anymore. Afraid I can't help, I've tried.
Basically two websites try to "compete" with each other like say one will have a discussion area and one won't. They'll see which one works better for the community, then they'll see how the other website's users react and then say ours react. Understand?