YES
Being in a debt management plan (DMP) does not have any effect on your right to make a claim. However, your own situation may differ, depending on your agreement with the debt management company you should be aware of the following:
You may be required to let your debt management company know that you plan to claim, as well as informing them about any subsequent compensation.
If the loan, credit card, mortgage, overdraft or other account you are complaining about was included in the DMP, your lender may automatically deduct some or all of the compensation and pay it to your debt management company.
If it was not included, then it is possible that you might still be required to make a payment to the debt management company.
It is possible that you may not end up with any money left over after paying back your DMP, however you will still have benefited from making the claim because your outstanding debt will have been reduced.