Unlike Microsoft Word, the values in Microsoft Excel are not written to the fields until they are populated. I.e. the user defined file properties can be filled, but the fields show no or old values.
If the value is not displayed correctly after a placement, this can have the following causes:
The AddIn is not installed. If the correct values are entered in the file properties, then the AddIn is correctly installed, see Show custom Word file properties.
You have named the cell incorrectly or forgotten to put the prefix in front of the key.
The used Custom File Property is a feature value, which is not supported in this document type.
The name is not populated by the placement module (yet).