Hello @NSF
Hope you are doing well.
Could you please confirm that is the memory region you are trying to write to (User memory or Configuration memory)?
What is the configuration of your Protection Pointer and related conditions?
Is there any chance you have perform a Lock operation to the region you are trying to write? What is the value of your NFC Lock Block Configuration blocks?
Please consider that we recommend using TapLinx SDK. This SDK provides some tools for contactless applications development in smartphones. The open API allows developers open access to all hardware features of NXP‘s NFC product portfolio. It provides a subset of features for quick and easy development of lightweight applications.
Regards,
Eduardo.