@Ajinkya_Bangale - Please ensure that both of your Month and Year Datatypes are string. If not, you need to cast them to string before you can do the concatenation operation. If you have your Order Year and Order Month is integer datatype, the below expression can be used to get the desired format that you are looking for. Hope this helps!
concat(right(concat(“00”, tostring({Order Month)), 2), " - ", tostring({Order Year}))
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