The sample length should be exactly equal to the distance between the support.
You didn't show a coordinate system, so I will assume that the sample length is along the X axis, the Y axis is up and the sample width is along the Z axis.
On the left end bottom edge of the sample, use a Displacement and set X, Y, Z to 0.
On the right end bottom edge of the sample, set Y and Z displacements to 0.
Now you have sufficient constraints and the system will solve if you apply a force to the row of nodes in the center on the sample on the top face.
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