Do I need OK TO BOARD to transit UAE?

The flydubai website FAQ states, in relevant part:

When do I need an OK to Board approval to fly with flydubai?

An OK to Board approval from flydubai is mandatory for India and Pakistan citizens travelling from the below cities:

Indian citizens: flying from Kochi, Kozhikode, Delhi or Hyderabad. The approval is required only if you have a paper visa or an electronic visa with the below conditions:

• Tourist or Visit visa: OK to Board required in case of ECR passports only.
• Employment visa: OK to Board required irrespective of ECR or ECNR passports.
• Stamped visa: OK to Board not required.

Approval for OK to Board

When you've paid for your booking, you can contact a local flydubai office or one of the flydubai travel shops in UAE, India or Pakistan (depending on where your visa is being processed) for the approval. Nominal charges will apply. Operating hours for flydubai local offices may vary.

Please note: your departure and return flight must be booked with flydubai. Please make sure to submit your original visa, passport copy, and booking receipt. It is your responsibility to obtain the approval prior to your departure. If you arrive at the airport without an OK to Board approval, you will not be allowed to check in and board your flight. flydubai will not be responsible for any losses you may incur as a result, including providing any refund of any amounts paid.

Obviously this doesn't make anything more clear for your circumstance. I suspect that because you are only transiting UAE that you do not require OK to Board, but to avoid all doubt, you should contact your local flydubai office or travel shop regarding OK to Board.