Can't authenticate youtube api client with access token

My backend generates the access_token with below redirect controller:

const logged = async (req: Request, res: Response) => {  const code = (req.query.code as string) || null;  const state = (req.query.state as string) || null;  const error = (req.query.error as string) || null;  const oauth2Client = new youtube.auth.OAuth2(    GOOGLE_CLIENT_ID,    GOOGLE_SECRET,    GOOGLE_REDIRECT_URI,  );  const { tokens: { access_token }} = await oauth2Client.getToken(code);  res.send({ access_token });};

Returned code is similar to: "ya29.<MUCH_MORE_CHARACTERS_HERE>_BtA0163"

Then somewhere else I'm trying to create a client with this access token like this:

const youtube = require("@googleapis/youtube");const youtubeApi = youtube.youtube({  version: "v3",  auth: "ya29.<MUCH_MORE_CHARACTERS_HERE>_BtA0163",});

(Btw I'm aware that I could get the client on the redirect controller. I just don't want to)

But everytime I try to access something, it gives me error:

  code: 400,  errors: [    {      message: 'API key not valid. Please pass a valid API key.',      domain: 'global',      reason: 'badRequest'    }  ]