My organization is currently testing a Juniper Mesa 3 running Android and Survey123 will not rotate into landscape mode. Based on other answers it appears that Survey123 should be able to rotate into landscape on tablet devices such as the Mesa 3. Since the detachable keyboard only attaches in landscape orientation this makes the device essentially unusable with Survey123.
We recently addressed a similar issue in 3.11 field app. What version of field app did you try with Mesa3?
Could you also try 3.12 beta build from our EAC website to see if the issue still persists?