The syntax of *ELEMENT_SOLID and *ELEMENT_TSHELL are the same, but the connectivity of tshells is more restrictive. You must confirm that the tshell normal direction (normal to the segment defined by the first 4 nodes of the element connectivity) is in the through-thickness direction. You can use LS-PrePost to check those normals by reading the keyword input into LS-PrePost and selecting EleTol > Normals > Tshell.
As for the number of integration points through the thickness, that’s a judgment call that should take the material model and the number of tshell elements through the thickness of the component into account.
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