From LWV Michigan League Links:

According to the Secretary of State’s office, approximately 314,000 inactive voter registrations were removed from the state’s voter rolls on Wednesday, April 2. These were registrations of voters who had received a cancellation notice based on change of residency and who did not respond to the notice or engage in voter activity in the two federal election cycles after receiving the notice. This cancellation represents the removal of more than 1.1 million out-of-date registrations under the Benson administration’s careful and active voter list maintenance process. 

 Michigan voters whose registrations were cancelled can re-register at any time, including up to and on Election Day.

Voters can also always check their registration status online at Michigan.gov/Vote or by contacting their local clerk.