The issue is not cleared in my case. My default code in Composer.json.

"repositories": [
    {
        "type": "composer",
        "url": "https://repo.magento.com/"
    }
]

---

@gelanivishal wrote:

Hello @cormac_haydon,

 

Please open your composer.json file and move to “repositories” section, and left only one repository, like shown below.

 

Before:

 

"repositories": {
    "0": {
        "type": "composer",
            "url": "https://repo.magento.com/"
    },
    "data-migration-tool": {
        "type": "git",
            "url": "https://github.com/magento/data-migration-tool"
    }
}

After:

"repositories": [
    {
        "type": "composer",
        "url": "https://repo.magento.com/"
    }
]

If you have still an issue then let us know.

 

--
If issue is solved, Click "Kudos" & "Accept as Solution"

---