Malformed OAuth2 Access Token When Deployed to Vercel

As far as I can tell the actual request from the deployed version is identical to the request sent by the local version that works correctly, and I'm unsure of what would be different with the request being made by the deployed version since it is the exact same code.

Here is the full error message:

DropboxResponseError: Response failed with a 400 code at /var/task/node_modules/dropbox/cjs/src/response.js:34:11 at process.processTicksAndRejections (node:internal/process/task_queues:95:5) at async exportSpl (/var/task/.next/server/pages/api/exportSpotifyPlaylist.js:115:9) { status: 400, headers: Headers { [Symbol(map)]: [Object: null prototype] { 'cache-control': [Array], 'content-security-policy': [Array], 'x-content-type-options': [Array], 'content-type': [Array], 'accept-encoding': [Array], date: [Array], server: [Array], 'content-length': [Array], 'strict-transport-security': [Array], 'x-robots-tag': [Array], 'x-dropbox-response-origin': [Array], 'x-dropbox-request-id': [Array], connection: [Array] } }, error: 'Error in call to API function "files/upload": The given OAuth 2 access token is malformed.' }