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It's the most wonderful time of the year - Santalytics 2020 is here! This year, Santa's workshop needs the help of the Alteryx Community to help get back on track, so head over to the Group Hub for all the info to get started!
Your formula [MONTH_YEAR]=DateTimeAdd([Previous_Month],1,"months") looks like it should work fine, however it may be worth checking data types. Are both [MONTH_YEAR] and [Previous_Month] fields stored as date data types? Otherwise a screenshot of the error would make it a lot easier to diagnose.
If this solves your issue pleas mark the answer as correct, if not let me know!