Hi,

I’m trying to use the python API to download files from a collaborator shared folder. I’m using a free developer account. I made an app and it was authorized (by myself). It was working fine in March 2024 and stopped working when I tried today (Sept 13 2024).

```

auth = CCGAuth(client_id='xxx',client_secret='xxx',user='xxx')
client = Client(auth)
user =  client.user().get()

"POST https://api.box.com/oauth2/token" 400 77{'date': 'Fri, 13 Sep 2024 17:49:32 GMT', 'content-type': 'application/json', 'strict-transport-security': 'max-age=31536000', 'set-cookie': 'box_visitor_id=66e478e2429fb8.44475236; expires=Sat, 13-Sep-2025 17:49:32 GMT; Max-Age=31536000; path=/; domain=.box.com; secure; SameSite=None, bv=PARTNERS-28114; expires=Fri, 20-Sep-2024 17:49:32 GMT; Max-Age=604800; path=/; domain=.app.box.com; secure, cn=33; expires=Sat, 13-Sep-2025 17:49:32 GMT; Max-Age=31536000; path=/; domain=.app.box.com; secure, site_preference=desktop; path=/; domain=.box.com; secure', 'cache-control': 'no-store', 'via': '1.1 google', 'Alt-Svc': 'h3=":443"; ma=2592000,h3-29=":443"; ma=2592000', 'Transfer-Encoding': 'chunked'}{'error': 'invalid_grant', 'error_description': 'Grant credentials are invalid'}

```

The client id and client secret are up to date, I also tried to reauthorize the app, although I didn’t make any modification. I’m stuck here.

I understand I can use OAuth2 and developer token, and it does work with the same client id and client secret, but the token only last 60 min and I need much more time to download multiple files. 
Could you help? Thank you.