Credentials error during installation of magento/module-invitation

[hungluuori3add]

Hello,
This is the first time we use Magento Cloud for our company, and we're stuck at composer install's credentials error for only magento/module-invitation (the other magento/ packages work fine):

Package operations: 364 installs, 0 updates, 0 removals
  - Installing magento/module-invitation (100.3.4): Downloading (connecting...)
                                                                                                                  
  [Composer\Downloader\TransportException]                                                                        
  Invalid credentials for 'https://repo.magento.com/archives/magento/module-invitation/magento-module-invitatio   
  n-100.3.4.0.zip', aborting.

The auth keys we used are from our sandbox account at https://marketplace.magento.com/customer/accessKeys/. I've searched for all the possible solutions around the web but no hope. 

Could you help me with this please? Thank you.

[Manthan Dave]

Hi @hungluuori3add 

Try to add your username and password (Public key and private key) in the auth.json file which is there in the root directory.

If auth.json is not there then create it and then add this credentials into that file  and then check it might resolve your isse.

Hope it helps !