SniCertificate::CertificateNonvalidError on website

netlify site name: https://stunning-dasik-1d2b1c.netlify.app/

custom domain: companion-connect.org

SniCertificate::CertificateNonvalidError: Unable to verify challenge for companion-connect.org: 15.197.225.128: Invalid response from http://companion-connect.org/.well-known/acme-challenge/NPzI7R5Y-zoaMDt9l3pgfnm9bqko0cpYbdMmIFiN69E: 403

We can’t renew your Let’s Encrypt certificate automatically until the issue is resolved. Check our troubleshooting guide for more information on how to fix the problem, and then renew the certificate.

I recently swapped to Netlify DNS. Help please!