The read access to the NT3H2211 chip fails already on slave address level (NAK received, like no chip is connected), but physical interface seems to be ok. I can communicate (read access) to PCT2075 (temp. sensor), PCF8574 (I/O expander) and also to another NFC tag (ST25DVxx). Is there some special setup from the NFC side required? My test hardware setup also didn't work with the flex antenna out of the OM5569 explorer kit (same NFC chip). Please see also the attached scope screenshot.