Hi !
Hablar
Imperativo =
Habla (tu) (accent on the u)
Hable (él, ella, Ud)
Hablemos (nosotros)
Hablad (vosotros)
Hablen (ellos, ellas, Uds)
As you can see, Usted conjugates as "él, ella" and "Ustedes" as "ellos, ellas"
hope I helped
It’s incorrect because the verb should be in the to form, not the he she form. I hope this helps!