It’s likely you applied for a product (i.e. a credit card or loan.) because you saw the following insight ‘You have no active credit cards’ or a credit builder card was advertised to you.
Please note that seeing you score drop as a result of opening a new credit account is normal. This is because a credit application (‘hard’ search) will appear on your credit report. Also, this account will increase the amount of available credit you have and reduce the average age of your accounts, all of which are factors taken into consideration when calculating your score.
However, this drop in your score should only be temporary. If you manage this new account responsibly, making your repayments on time and in full, it should have a positive impact on your credit score over time.