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Why haven't you preferred a 'Formula' tool instead of multi-row tool? Just curious. In these situations (works locally, errors on gallery), I prefer to add an Output tool with yxdb format. This yxdb file will provide the Multi-row tool output wherein you get a clarity of the missing variable. Hope this suggestion helps you fix the issue. Good Luck!
Just a thought here, but try taking the "&" out of your field name. Replace it with "and". Workflows are stored as xml files and it's possible that the "&" is being translated to & at some point in the process of moving it to the gallery