From The New York Times — 

Arkansas is the first state to test it, and thousands have been kicked off the program.

The Trump administration argues that imposing work requirements for Medicaid is an incentive that can help lift people out of poverty. But a test program in Arkansas shows how hard it is merely to inform people about new incentives, let alone get them to act.

In the first month that it was possible for people to lose coverage for failing to comply, more than 4,300 people were kicked out of the program for the rest of the year. Thousands more are on track to lose health benefits in the coming months. You lose coverage if you fail to report three times, and the program, in effect for three months, is slowly phasing in more people.