Keep getting an authentication error in mongoose track

As the title says i cant connect to the mlab DB

my setup is looking like this:

const mongoose = require(‘mongoose’);

and my MONGO_URI string = MONGO_URI=mongodb://

and in the logs i’m seeing these errors:
ode v8.11.4, with pnpm


Resolving: total 79, reused 79, downloaded 0

Resolving: total 79, reused 79, downloaded 0, done

Total install time: 3295ms

(node:987) DeprecationWarning: current URL string parser is deprecated, and will be removed in a future version. To use the new parser, pass option { useNewUrlParser: true } to MongoClient.connect.

:traffic_light::tv: Your app is listening on port 3000

(node:987) UnhandledPromiseRejectionWarning: MongoError: Authentication failed.

at /rbd/pnpm-volume/b8186aec-8a36-4d1b-9ba0-c1c3b5dab7c9/node_modules/

at authenticateStragglers (/rbd/pnpm-volume/b8186aec-8a36-4d1b-9ba0-c1c3b5dab7c9/node_modules/

at Connection.messageHandler (/rbd/pnpm-volume/b8186aec-8a36-4d1b-9ba0-c1c3b5dab7c9/node_modules/

at emitMessageHandler (/rbd/pnpm-volume/b8186aec-8a36-4d1b-9ba0-c1c3b5dab7c9/node_modules/

at Socket.<anonymous> (/rbd/pnpm-volume/b8186aec-8a36-4d1b-9ba0-c1c3b5dab7c9/node_modules/

at emitOne (events.js:116:13)

at Socket.emit (events.js:211:7)

at addChunk (_stream_readable.js:263:12)

at readableAddChunk (_stream_readable.js:250:11)

at Socket.Readable.push (_stream_readable.js:208:10)

at TCP.onread (net.js:597:20)

(node:987) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)

(node:987) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

any help is very welcome!