Invalid grant - grant credentials are invalid

Hi, I am aware there are other posts regarding this subject but they seem outdated. I have an application that I setup since February 2023 to upload and download files successfully. I have had very few problems with this. I am trying to use this feature again currently but am now getting the error as listed in the titled of invalid grant - grant credentials are invalid. I have received emails that some changes have been made to the Box API but I cannot find anything indicating a change that would relate to my issue here. For reference, the last time I used and successfully was able to upload and download was August 23, 2024. The client ID for this app is

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The code I am sending is as such:

await fetch('https://api.box.com/oauth2/token', {

                    method: 'POST',

                    headers: {

                        'Content-Type': 'application/json'

                    },

                    body: JSON.stringify({ "grant_type": "client_credentials", "client_id": clientID, "client_secret": clientSecret, "box_subject_type": 'user', "box_subject_id": userID })

                })

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