Hi,
I'm running Magento 2.3.5 via Plesk Onyx,
Checking my cron logs there is a message being spammed in there with:
Magento supports PHP 7.1.3 or later. Please read <link to magento website guide>
I think the issue is stemming from the fact that my Plesk is being ran on Ubuntu 16.04.06 LTS and the base PHP version is 7.0.33.
Within Plesk you can obviously set your websites to run on different versions of PHP. The website I'm having an issue with is being ran on PHP 7.3.20.
How can I make composer use this version?