Assuming you are using CV AB for output, on the A4 CV track you have:
TUN : 0
FIN : 0
BND : 0
SLD : 0
SRC : CV

CV A is set to V/Oct
CV B is set to Gate

On the Atlantis, with nothing else plugged in, you have CV A going to the VCO v/oct input, CV B going into the Envelope gate input, and since I don’t have one I’ll assume that 2 is a good starting place to have the octave switch on the VCO.

Do you have any modulation sources going into the Atlantis that could be causing a problem? Are you using the LFO to modulate anything? S&H? Zero that out.

On the A4, do you have any of the LFOs on the CV track modulating your CV outs? Make sure that’s all zero’d out.

When that’s all set, if you have the keyboard on the A4 set in the middle (LED is in the center of the column), you should be able to get at least 1 octave playing correctly.