Hi kj2607,
Welcome to the Sony Community!
What is the error message that you are getting? Did the software installed in the Galaxy Tab S2?
This link can help you with your concern about Wi-Fi and PlayMemories Mobile.
For further assistance regarding your concern, please contact the Sony offices/Sony representative offices nearest to your place of residence in Asia Pacific region http://www.sony-asia.com/countryselector.html?hpid=countryselector:AsiaPacific. Due to proximity, they are in a better position to respond to your questions or concerns.
If my post answers your question, please mark it as "Accept as Solution"
Best regards,
Zander