Sorry I didn’t respond before the holiday. Thanks for the feedback. Status: -1 is a timeout. Status 133 is a generic “GATT ERROR”, which usually means something’s become screwed up inside Android’s BLE library.
I’ve tested the beta on a Pixel 2 and a Galaxy S6, so I’m optimistic it should work for you. Are you still stuck or did it start working again after a reboot of the phones and meter?