On this documentation page: https://docs.uipath.com/activities/other/latest/user-guide/add-queue-item
It says:
* Item Information - A collection of additional information about the specific QueueItem that is to be added. The information is stored in the item and is used during a transaction processing. It is recommended to use only primitive values of the following types: Number, Boolean, String and DateTime. The value of string arguments cannot contain the following characters: [
and " "
. Argument names cannot contain the following characters: :
, .
, ,
, @
, "
.
That last part is incorrect, as we have automations where the queue item has an argument with a comma (,) in it. I haven’t tested all the other listed characters.