Data Prep not joining datasets

Hello,

I have multiple data sets i am pulling from zoho crm I am trying to combine a subform data set with its parent module using left join. Anytime i do so i receive the error Column DS.Id not found for the join transform. Please input dependent column.

Has anybody else experienced it only seems to be happening when trying to combine a subform with really any sort of data set. Here is a screen recording showing the issue. Combine tables inop .mp4

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