cURL error 35. Are our IPs blocked?

Depending on how curl is checking the trust store for root certificates it could just be that ISRG Root X1 isn't found in under Certificate > Local Computer > Trusted Root Certification Authorities. If not, try something like this to install it: Subset of Windows Users See Expired Let's Encrypt Certificates with `curl` - #24 by webprofusion

Assuming curl is present on the machine curl should return a response OK. If the ISRG Root X1 cert is missing, try curl before and after installing and let us know if that fixed it.

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