MTM/AndroidPinning broken in 0.71
Fortunately 0.71 is not an official release, but the MTM/AndroidPinning combo is broken in the version. When presented with a new cert using the same private key (so a certificate that should be accepted according to the pinned list embedded in the code) it presents the "Accept Unknown Certificate" dialog.
It looks like this must be due to the changes made in that area prior to that release being tagged. It works fine with 0.70-test and earlier.