Customer Portal signatures will only be displayed on the state equivalent e-file forms 8879/8453 if the state supports a digital signature.
Note: The signatures do not appear on the on the primary state forms (that are the state equivalent to the 1040).
At the time of this post, the following states support a digital signature on the state 8879/8453
AL, AR, AZ CA, CO, DE, GA, IA, IL, IN, KY, LA, MA, MD, MI, MS, NM, NY, OK, OR, PA, SC, VA, VT, WV