Custom SSL Error: "Certificate issuer not found in certificate chain"

When trying to add the SSL Cert, i’m getting the following error: “Certificate issuer not found in certificate chain”

I’ve been provided with my certificate details in the following format by my current hosting company:

Certificate

-----BEGIN CERTIFICATE-----
… [redacted]
-----END CERTIFICATE-----

Private Key

-----BEGIN PRIVATE KEY-----
… [redacted]
-----END PRIVATE KEY-----

CA Bundle

-----BEGIN CERTIFICATE-----
… [redacted]
-----END CERTIFICATE-----

-----BEGIN CERTIFICATE-----
… [redacted]
-----END CERTIFICATE-----

Good question, the way to format certs for upload into section.io is as follows:

Public certificate & chain:
Certificate followed by CA Bundle (Without the root certificate):

This would look like:
-----BEGIN CERTIFICATE-----
… [redacted]
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
… [redacted]
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
… [redacted]
-----END CERTIFICATE-----

Private key:
Private key (PEM format)

This would look like:
-----BEGIN PRIVATE KEY-----
… [redacted]
-----END PRIVATE KEY-----

Some further details available:
https://www.section.io/docs/setup-https/