Bridge invalid request error

[mikeshultz]

Seen in logs in prod:

Error: cannot POST /oauth2/v4/token?client_id=[REDACTED]&client_secret=[REDACTED]&redirect_uri=[REDACTED]&grant_type=authorization_code&state=[REDACTED] (400)
          at Response.toError (/app/node_modules/superagent/lib/node/response.js:98:13)
          at ResponseBase._setStatusProperties (/app/node_modules/superagent/lib/response-base.js:119:48)
          at new Response (/app/node_modules/superagent/lib/node/response.js:44:8)
          at Request._emitResponse (/app/node_modules/superagent/lib/node/index.js:904:18)
          at /app/node_modules/superagent/lib/node/index.js:1100:42
          at IncomingMessage.<anonymous> (/app/node_modules/superagent/lib/node/parsers/json.js:22:7)
          at Stream.emit (events.js:198:13)
          at Unzip.<anonymous> (/app/node_modules/superagent/lib/node/unzip.js:53:12)
          at Unzip.emit (events.js:203:15)
          at endReadableNT (_stream_readable.js:1145:12)
          at process._tickCallback (internal/process/next_tick.js:63:19)

CC @shahthepro