Favored enemy question

Since Xanathars came out, can i still use the revised ranger favored enemy with the xanathars option?

The revised ranger isn't part of Xanathar's Guide, so it is still unofficial/playtest content. Of course, your DM can allow it.

The Ranger conclaves in XGtE are just additional conclaves for the PHB Ranger. The Revised Ranger from UA is a completely different class with its own conclaves. Don't try and mix the two.

The archetypes in XGtE are intended for use with the standard Ranger.