Ok I understand, Utah law requires a 3 day notice to vacate. Now this is only a notice to vacate, what typically happens is that tenant doesn't leave after receiving the notice. When this occurs, the only option is to file an eviction petition with the courts seeking an eviction order.
An issue you have is the fact a defense to an eviction is receipt of improper notice. Utah law doesn't recognize a 2 day notice to vacate. As such, as difficult as this is to tell you this, if you went to court, the judge is unlikely to issue an eviction order if the tenant raises a defense that they did not receive proper notice.
This leaves you with likely needing to serve a notice to vacate again with a proper 3 day notice, I have provided a link below to free forms from Utah. An then if they do not leave, unfortunately you will have to take them to court. Evicting a tenant is a 1 and 2 step process. The first step is to serve proper notice to the tenant to vacate. Hopefully, this is all that is needed and the tenant leaves. However, if they do not, the fact that you served notice then gives the landlord the right to seek a court ordered eviction.
These two sites should be of great benefit to you: https://www.utcourts.gov/howto/landlord/eviction.html#summary and
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