Acknowledgements not queued

Hi, I am trying to set up Acknowledgements but it is not picking up some constituents in the list even though the dates are within range. I looked at the contribution/acknowledgements screen in their records and see they do not have an Acknowledgement queued. I have read through the documentation and can't find anything about how to get it into the queue other than that it should happen automatically when you post the contribution... any ideas what I am missing?

In the references table my parameters are all set to 'All' at the moment so nothing there is limiting it.

Thank you, Katie

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