Certificate failed ot bad cert with traefik in GCP K8

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My domain is: goship.com , plsthree.pro, plspro.com and a few others.

I ran this command: this gets updated automatically from traefik ingress controller in GCP K8

It produced this output: remote error: tls: unknown certificate authority

My web server is (include version): apache, tomcat

The operating system my web server runs on is (include version): ubuntu 20

My hosting provider, if applicable, is:GCP

I can login to a root shell on my machine (yes or no, or I don't know): yes

I'm using a control panel to manage my site (no, or provide the name and version of the control panel):
no
The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot): I don;t know its in the trafik controller logic

I think the simplest "fix" is to use another FREE CA [like: ZeroSSL]

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Using this online tool SSL Server Test (Powered by Qualys SSL Labs)
SSL Server Test: goship.com (Powered by Qualys SSL Labs) has a valid LE issued certificate
SSL Server Test: plsthree.pro (Powered by Qualys SSL Labs) has a valid LE issued certificate
SSL Server Test: plspro.com (Powered by Qualys SSL Labs) has a valid Network Solutions OV Server CA 2 issued certificate

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