AGN are the most luminous, persistent sources in the Universe. They are also among the most variable at all wavebands. Flux and spectral variations are observed on short time scales and hold significant information regarding the physical processes that operate in the immediate vicinity of their central supper-massive black holes. Significant progress has been made the last few years, both with observations from the current X-ray observatories (like XMM-Newton, NuSTAR, NICER, Swift) and in theoretical advancements of the study of the corona properties and the inner accretion flow. With the recently launched world's first satellite mission dedicated to X-ray polarimetry, IXPE, the very first polarimetric observations of AGN will be performed in early 2022. The main aim of this event is to bring together both theorists and observers, and to review the latest advances in this field, including: i) X-ray spectral/timing properties of AGN, ii) X-ray polarimetric observations of AGN, iii) X-ray corona properties and modelling, iv) the disc/corona interplay and the recent, Swift plus ground based multi-wavelength campaigns, v) X-ray reflection and disc thermal reverberation, vi) the nature of the 'soft excess', and vii) the nature of the inner accretion flow in AGN.