Hi,
At the end of the tax year a reconciliation will occur, where your full allowance will be offset against your total income and any refund would be calculated then.
If the allocated allowances with your tax code 986L is above what you will earn there, meaning you will have some unused that could be allocated to your second job, then you can contact HMRC to change the allocation of your allowances.
Income Tax: general enquiries.
Thank you.