I’ve actually faced something very similar while working on a hosted setup where a PEM certificate upload kept failing even though the full chain (cert + intermediate + root + key) looked correct.
In my case, the issue wasn’t the certificate itself but how the PEM was being interpreted during upload. Re-exporting the chain cleanly and making sure there were no extra spaces, hidden characters, or incorrect ordering between the certificate and private key sections fixed it. In some environments, even small formatting differences can cause the upload to fail while the same file works elsewhere (like cloud instances).
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