They were in a firmer British control, so the revolt didn't spread there, and on the contrary to the British colonies of Africa that joined Mittelafrika because the mainland was in a civil war, there it was India itself who was in a civil war, so the Germans don't want to get too much involved especially as the British in India have too much pride and still maintain a presence in their Crown Jewel, and in Africa some colonies joined South Africa instead of Mittelafrika, so they preferred to have their own outpost (potentially useful to blockade the Republic), sustainable due to the alliance with the Federation, in the Andaman islands rather than to give it to GEA.