When setting the value for the distribution_lists property, the field will not work with a parameter (for example ${param_name}).

As a test, I put in a value straight into the field; "TeamName", the ipa was uploaded and the correct team mates were given access to the build. Setting a String Parameter called "PARAM_NAME" to "TeamName" and setting the distribution_lists field to $PARAM_NAME results in no team mates getting access to the build.

Please see the attachments for examples of the values.

Note, I tested that the parameter was substituted correctly into the Build Notes field.