I'm looking for some pointers on how to start trying to workout what the problem is with my composer installation.
C:\xampp>composer diagnose
Checking composer.json: OK
Checking platform settings: FAIL
The xdebug extension is loaded, this can slow down Composer a little.
Disabling it when using Composer is recommended, but should not cause issues beyond slowness.
Checking git settings: OK
Checking http connectivity: OK
Checking disk free space: OK
Checking composer version: OK
C:\xampp>composer self-update
You are already using composer version 1e27ff5e22df81e3cd0cd36e5fdd4a3c5a031f4a.