The problem might have to do with context, as in, does your action have the context of which row to pull the Id from? If you’re doing this action from a row action on a table or from a queue click action, you should be fine. In that case, would you mind posting a screenshot or two of your setup in the page builder?
However, if you’re doing this action from a different situation, such as just a button on the page, {{Id}} isn’t enough. You have to also specify the model by doing something along the lines of {{$Model.ModelName.data.0.Id}}. In this situation, you should really only pull the Id from models that you know only have one row, because you have to specify which row to pull from (my example above pulls the Id from the first row).
Thanks!
