Dual extrusion problem with octoprint

[javi.pacheco]

When I send a dual extrusion gcode from Octoprint, this only uses one color, but the gcode works fine from SD card

For my tests, I have put 2 extruders and "Shared Nozzle" in Octoprint settings. I have used 16 extruders because I have read that you have to put the number of virtual extruders (16 for a20m)

This is part of my log

2020-04-18 18:29:18,553 - Recv: echo:busy: processing
2020-04-18 18:29:18,568 - Recv: T:190.80 /190.00 B:60.14 /60.00 @:41 B@:71 W:0
2020-04-18 18:29:18,740 - Recv: T:190.03 /190.00 B:60.16 /60.00 @:77 B@:68
2020-04-18 18:29:19,455 - Recv: ok
2020-04-18 18:29:19,460 - Send: N27 M10518
2020-04-18 18:29:19,466 - Recv: ok T:190.48 /190.00 B:60.05 /60.00 @:60 B@:82
2020-04-18 18:29:19,479 - Send: N28 M109 T1 S19031
2020-04-18 18:29:19,493 - Recv: echo:M109 Invalid extruder 1
2020-04-18 18:29:19,494 - T1 reported as invalid, reverting to T0
2020-04-18 18:29:19,496 - Recv: ok
2020-04-18 18:29:19,499 - Not queuing T0, that tool doesn't exist according to the printer profile or was reported as invalid by the firmware
2020-04-18 18:29:19,504 - Send: N29 M82*34
2020-04-18 18:29:19,509 - Recv: ok

It looks like octoprint can't select the extruders

Any idea?

Thanks!