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Kindly follow the steps provided below to resolve your query.
A common reason you may receive the error Could not establish trust relationship for the SSL/TLS secure channel is because the SSL certificate isn't trusted. If the SSL certificate is not trusted, you will need to install the SSL certificate's root certificate.
Go to this link for reference and additional troubleshooting procedures https://patchmypc.com/could-not-establish-trust-relationship-for-the-ssl-tls-secure-channel#:\x7e:text=A%20common%20reason%20you%20may,the%20SSL%20certificate%27s%20root%20certificate
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