API requests to subdomain failed

We have create a new cloudflare account and apply the account on our domain, and it’s subdomain
now everything on the parent site is working but calling APIs from the second site is not working
it gives me /

Log Entry :
12/07/2021 08:06:4
ex.Message: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.

what should i do to resolve this?

FYI : without cloudflare both are working well and APIs are called correctly.

Hi @user13533 I see your duplicate tickets with Support have been merged in order to not slow replies to you and everyone else. Let us know on the ticket if the client you are using to query supports SNI.

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Our windows server is 2019 so I think my client support SNI

we still have the issue reply to us, please.

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