Hi Mandy Truter,
Thank you for reaching out to us on Microsoft Q&A forum.
In Business Central, registration with email addresses from consumer email services or telecommunication providers such as outlook.com, hotmail.com, and gmail.com is not supported.
If you attempt to sign up with such a personal email address, you will receive a notification prompting you to utilize a work or school email address instead.
Therefore, it is necessary to provide an email address associated with your workplace or educational institution in order to successfully complete the sign-up process.
Upon submission of the work email address, you may proceed to practice the session.
If you are still facing any issue, please let us know in the comments. We are glad to help you.
If the information is helpful, please Accept Answer so that it would be helpful to community members.
Thank you.