Previously I already tried to import the full chain of certificates with the same result.
Now just tried to generate and import a .PEM file with each one of the following 4 certificates, didn't work, same error:
---
Certificate chain
0 s:/CN=trustar.co
i:/C=US/O=Amazon/OU=Server CA 1B/CN=Amazon
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
1 s:/C=US/O=Amazon/OU=Server CA 1B/CN=Amazon
i:/C=US/O=Amazon/CN=Amazon Root CA 1
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
2 s:/C=US/O=Amazon/CN=Amazon Root CA 1
i:/C=US/ST=Arizona/L=Scottsdale/O=Starfield Technologies, Inc./CN=Starfield Services Root Certificate Authority - G2
-----BEGIN CERTIFICATE-----
MIIEkjCCA3qgAwIBAgITBn+USionzfP6wq4rAfkI7rnExjANBgkqhkiG9w0BAQsF
ADCBmDELMAkGA1UEBhMCVVMxEDAOBgNVBAgTB0FyaXpvbmExEzARBgNVBAcTClNj
b3R0c2RhbGUxJTAjBgNVBAoTHFN0YXJmaWVsZCBUZWNobm9sb2dpZXMsIEluYy4x
OzA5BgNVBAMTMlN0YXJmaWVsZCBTZXJ2aWNlcyBSb290IENlcnRpZmljYXRlIEF1
dGhvcml0eSAtIEcyMB4XDTE1MDUyNTEyMDAwMFoXDTM3MTIzMTAxMDAwMFowOTEL
MAkGA1UEBhMCVVMxDzANBgNVBAoTBkFtYXpvbjEZMBcGA1UEAxMQQW1hem9uIFJv
b3QgQ0EgMTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBALJ4gHHKeNXj
ca9HgFB0fW7Y14h29Jlo91ghYPl0hAEvrAIthtOgQ3pOsqTQNroBvo3bSMgHFzZM
9O6II8c+6zf1tRn4SWiw3te5djgdYZ6k/oI2peVKVuRF4fn9tBb6dNqcmzU5L/qw
IFAGbHrQgLKm+a/sRxmPUDgH3KKHOVj4utWp+UhnMJbulHheb4mjUcAwhmahRWa6
VOujw5H5SNz/0egwLX0tdHA114gk957EWW67c4cX8jJGKLhD+rcdqsq08p8kDi1L
93FcXmn/6pUCyziKrlA4b9v7LWIbxcceVOF34GfID5yHI9Y/QCB/IIDEgEw+OyQm
jgSubJrIqg0CAwEAAaOCATEwggEtMA8GA1UdEwEB/wQFMAMBAf8wDgYDVR0PAQH/
BAQDAgGGMB0GA1UdDgQWBBSEGMyFNOy8DJSULghZnMeyEE4KCDAfBgNVHSMEGDAW
gBScXwDfqgHXMCs4iKK4bUqc8hGRgzB4BggrBgEFBQcBAQRsMGowLgYIKwYBBQUH
MAGGImh0dHA6Ly9vY3NwLnJvb3RnMi5hbWF6b250cnVzdC5jb20wOAYIKwYBBQUH
MAKGLGh0dHA6Ly9jcnQucm9vdGcyLmFtYXpvbnRydXN0LmNvbS9yb290ZzIuY2Vy
MD0GA1UdHwQ2MDQwMqAwoC6GLGh0dHA6Ly9jcmwucm9vdGcyLmFtYXpvbnRydXN0
LmNvbS9yb290ZzIuY3JsMBEGA1UdIAQKMAgwBgYEVR0gADANBgkqhkiG9w0BAQsF
AAOCAQEAYjdCXLwQtT6LLOkMm2xF4gcAevnFWAu5CIw+7bMlPLVvUOTNNWqnkzSW
MiGpSESrnO09tKpzbeR/FoCJbM8oAxiDR3mjEH4wW6w7sGDgd9QIpuEdfF7Au/ma
eyKdpwAJfqxGF4PcnCZXmTA5YpaP7dreqsXMGz7KQ2hsVxa81Q4gLv7/wmpdLqBK
bRRYh5TmOTFffHPLkIhqhBGWJ6bt2YFGpn6jcgAKUj6DiAdjd4lpFw85hdKrCEVN
0FE6/V1dN2RMfjCyVSRCnTawXZwXgWHxyvkQAiSr6w10kY17RSlQOYiypok1JR4U
akcjMS9cmvqtmg5iUaQqqcT5NJ0hGA==
-----END CERTIFICATE-----
3 s:/C=US/ST=Arizona/L=Scottsdale/O=Starfield Technologies, Inc./CN=Starfield Services Root Certificate Authority - G2
i:/C=US/O=Starfield Technologies, Inc./OU=Starfield Class 2 Certification Authority
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
I have tried some other things like importing the certificate directly to the server, running out of ideas.
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