Magento cloud setup install failure

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Hi,

I am trying to install magento in magento cloud.

To do so I did:

- check out https://github.com/magento/magento-cloud
- setup auth.json
- setup env:COMPOSER_AUTH in the project with same values stored in auth.json
- pushed everything in a separate branch called staging in the magento cloud environment

However the composer install does not work.
In the cloud and in my local machine I got

```
W: [Composer\Downloader\TransportException]
W: The "https://repo.magento.com/archives/magento/module-staging-page-builder/magento-module-staging-page-builder-1.7.0.0-patch1.zip" file could not be downloaded (HTTP/1.1 404 Not Found)
In my local pc (with php 7.4) i have different issues (they turn based on the composer install run).
```

I tried also with `composer config -g repo.packagist composer https://packagist.org` in local but all I got was different error messages:

```
The "https://repo.magento.com/archives/magento/module-banner/magento-module-banner-101.2.3.0.zip" file could not be downloaded (HTTP/2 404 )
The "https://repo.magento.com/archives/magento/module-invitation/magento-module-invitation-100.4.2.0.zip" file could not be downloaded (HTTP/2 404 )
The "https://repo.magento.com/archives/magento/module-banner-customer-segment/magento-module-banner-customer-segment-100.4.1.0.zip" file could not be downloaded (HTTP/2 404 )
The "https://repo.magento.com/archives/magento/module-invitation/magento-module-invitation-100.4.2.0.zip" file could not be downloaded (HTTP/2 404 )
```

With composer update i have

```
- Root composer.json requires magento/magento-cloud-metapackage 2.4.3, found magento/magento-cloud-metapackage[2.4.3] in the lock file but not in remote repositories, make sure you avoid updating this package to keep the one from the lock file.
```

What am I doing wrong?

Start by reproducing `composer install` in the magento-cloud checkout with `auth.json` and the `env:COMPOSER_AUTH` value described in the report. Compare the failing archive URLs and the `magento-cloud-metapackage` resolution during `composer update`; done means the reported packages install successfully in the cloud environment.

Written by the indexing model from the issue text.