"To provide a reason" means to offer an explanation or justification for something. It is explaining why or how something happened or why a certain decision was made. Full definition
The researchers did not measure the serum levels of these animals, and they didn't provide any reasoning for choosing the dose they did. (drfionand.com)
Many authorities could not provide reasons why more parents appeared to be choosing home - schooling. (educationviews.org)
This allows the traveler to cancel the trip without providing a reason, but must do so at least 48 hours prior to departure. (squaremouth.com)