Finding Lipschitz constant from Gradient and Hessian of log-sum-exp

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I have calculated the Gradient and Hessian of log-sum-exp as mentioned in the accepted answer here. I would like to find Lipschitz constant L, in $|F(x)-F(x^{'})| \leq L ||x-x'||_2$. I have been at this problem for 2 days but unable to find a solution. What am I missing?