Hi @edanish70,
We recommend using Codesys version 3.5.15.50 because our R&D team has tested this version extensively. A later version may be used but we cannot predict what issues may occur when using later instances. So, you may be correct, this issue may be caused by not using the recommended version of Codesys.
You could also try following the instructions in this forum post on using EIP within Codesys. It’s also possible that the the HMI’s Codesys firmware needs to be updated (instructions provided in the post).