NET::ERR_CERT_AUTHORITY_INVALID Error on A subdomain

We are using a third party service mapped using cname record to our subdomain. We have provided them the pfx file for the certificate. Our certificate was working smoothly for quite some time.But before 10-15 days invalid cert authority error has been showing. Kindly let me know if this is any kind of configuration error at third party.

NET::ERR_CERT_AUTHORITY_INVALID
Subject: community.innov8.work

Issuer: community.innov8.work

Expires on: 28 Jan 2018

Current date: 9 Jan 2018

PEM encoded chain:
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

You are using a self signed certificate.

Can you provide the details please of what you are trying to do, what you have tried, and what the issue is?

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