I set up a form that has a user input an account number. I set a maximum so it cannot go over 10 digits. However, I need to set a minimum at 10 so they don't submit a partial account number.

I set up a form that has a user input an account number. I set a maximum so it cannot go over 10 digits. However, I need to set a minimum at 10 so they don't submit a partial account number.
Easiest way to control that is to set your submit button based on the validation of that field.
Example: On the DisplayMode property of your submit button:
If(Len(textInputField.Text)<>10, Disabled, Edit)
This way the button is not available unless they have a valid length number.
Might also want to consider changing the back color of the field or making a label visible if the length is not 10.
Hope that helps.