I had already read that link and as for limitations in combobox it is only limited to click activities in simulation mode, but I do not see any limitation in the Get details of a UI element in window activity.
As I said, the element recognizes it since I can select an option from the combobox or obtain its name attribute. What I cannot do is get the Own text since it gives me the error I mentioned (Object reference not set to an instance of an object).
When you tell me to get the data from the source, it is not a solution for me since it is a third-party application and I do not have access to the direct query to the database.
Out of curiosity I have tried with another RPA (uipath) and the text can be obtained without difficulty, so I understand that the element has no restrictions in terms of obtaining the text from the combobox.
There should be some way to get the text. What am I missing?