They exist but how on earth did they get there? Sure you always have a few people who get itchy feet and want to see the world but this was enough people to set up an entire culture.
I have read some of the research but none of it seems to fit very snuggly.
The Romans banished Jews from the land in 70 AD.
600 years before that, the Babylonians did the same.
Not everyone left but large numbers of tribes scattered and resettled elsewhere. Obviously many stayed in the ME, North Africa, and others to Central Europe. The Ethiopian Jews are thought to be descended from the tribe of Dan or Judah. They kept enough ancient Jewish traditions and artifacts alive in their culture that the Rabbis of Israel determined that they were Jews. I’m not sure if there’s been any subsequent DNA analysis.