Web midi api input not working

Midi input from my oxygen49 is not working. I’m using chrome and the web midi api is working but hookpad doesn’t get any input .
On the chrome Dev Console it correctly logs some input from the midi but nothing works in hookpad.
Example from chrome developer console: new:645 MIDI data Uint8Array(3) [155, 57, 73]
Am i doing something wrong?

Edit: I think i found the problem : Uncaught TypeError: f.sendMidiMessage is not a function at midiProc (new:699) at MIDIInput.onMIDIMessage (new:647)
I’ve got a 403 on https://www.hooktheory.com/hookpad/tabsGet/ . Don’t know if it’s related.

Sorry for the the trouble, I’m going to PM you with some debug info if you don’t mind, to see if we can get this working