There are a number of ways to contact M1 Finance; you can reach out via phone, email, and chat for all questions about your account. For urgent matters, you can reach M1 Finance by phone at (312) 600-2883. You can also get in touch via email with an expected response time of approximately one business day. Another option to contact M1 Finance is through the chat option on their site. One important thing to note is that M1 Finance customer service is only available during U.S. market hours (Monday through Friday, from 9 am to 4 pm EST; holiday hours may vary).