I didn't receive a text message from the admissions office when I signed up for the single recruit.

You don't need to worry at this time, because you registered successfully but didn't send you a text message. Maybe your web page is stuck and your information has not been submitted yet. You need to submit the information to the background, and after the background verifies the information, it will send you a confirmation report in the form of SMS. If they haven't finished the review, they won't send you a message so soon.