Arm IK randomly broken

Support Animation and Rigging
1

Hello, For some reason I have been having trouble with the IK on one of my models. https://youtu.be/2GfoJvsqMPk It randomly stopped working after being just fine for a while. the elbow just refuses to bend I have:
Increased the pre bend in the Elbow
Double Checked nothing has weird parentage
Rebuilt the IK entirely

Can anyone tell me what is going on?

2

if the other arm still works, could you try copying those bones and mirroring them?

3

Turns out that was the problem. I had a limit Z in the inverse kinematics for the bone properties, but did not invert it for the right arm. switched the numbers and everything is working.