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Your code looks right. However, to estimate an affine transformation you need at least 3 points, but if these points are all aligned, there is an infinity of solutions, which seems to lead the estimation to result in a degenerate solution.

Although that might no longer be true as you set fullAffine to false, perhaps the function is implemented in such a way that it still needs points that are not aligned. But that is a supposition.

What is the result if you add another point? For example:

obj1.push_back(Point2f(0, 0));
scene1.push_back(Point2f(10, 10));