complex – Taking absolute square of the following term

I have this equation and I wanted to find the absolute square of this term in Mathematica

$$ H_1 = left | 1 + j; left(frac{ 2 pi}{1-e^lambda}right) right|^2 $$

I did this in mathematica

H1 = Abs(1 + 1*i*((2*Pi)/ (1 - e^(-(Lambda)))))^2

which does not yield any result.

then I did this enter image description here

Can anyone help? As the absolute square is just square of real-term and imaginary term which should be simple. Solving this on paper is quite simple