[arethuza]

By that point the Allies (actually originally just Roosevelt, with the others following along) had insisted on unconditional surrender:

"those Germans — and particularly those German generals — who might have been ready to throw Hitler over, and were able to do so, were discouraged from making the attempt by their inability to extract from the Allies any sort of assurance that such action would improve the treatment meted out to their country."

https://en.wikipedia.org/wiki/Unconditional_surrender