See this for uan activation and other details Universal Account Number (UAN) & Employee Provident Fund (EPF) : Rules, Procedure, Return, Claim & Updates
21st October 2016 From India, Kolkata
Since you mentioned that it is an Inoperative Account, then the account is older than 3 years. So, UAN Number would not been generated for that number during that period of time.
To PF transfer to new account, you can visit the Inoperative Account Helpdesk available in all PF Office. Also, Online Inoperative Account Helpdesk is available in EPF Portal. Please make use of it.
If you want to withdraw the PF Amount, apply through that (previous) employer with Form 19 along with a request letter to the PF Office for withdrawal typed/written in a 20 rupees Bond Paper. Don't forget to mention the valid reason for not ( or delay in) withdrawing that account till date in that letter.
21st October 2016 From India, Chennai