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Your NS and CAA records are as follows
% dig +short NS digitup.in
ns-928.awsdns-52.net.
ns-1454.awsdns-53.org.
ns-1806.awsdns-33.co.uk.
ns-485.awsdns-60.com.
% dig +short CAA digitup.in
0 issuewild "letsencrypt.org"
0 issue "letsencrypt.org"
%
According to their documention, the CAA record need to be created as follows
To ensure that only Netlify can create Let’s Encrypt certificates for your custom domain, you can add a Certificate Authority Authorization (CAA) record to your DNS provider that specifies Netlify’s accounturi, which is https://acme-v02.api.letsencrypt.org/acme/acct/54403714.
which means something like below
% dig +short CAA digitup.in
0 issue "letsencrypt.org;accounturi=https://acme-v02.api.letsencrypt.org/acme/acct/54403714"
Do edit your existing CAA records, and change value from 0 issue "letsencrypt.org" to 0 issue "letsencrypt.org;accounturi=https://acme-v02.api.letsencrypt.org/acme/acct/54403714"
As per Netlify documentation
If you’re having trouble with the automatic provisioning, visit the troubleshooting page for an error message guide and other tips. You can also visit our Forums for a verified Support Guide on SSL / TLS certificate provisioning
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asked 2 years ago

I have made the necessary changes but the error is still the same.
As error is from Netlify, you can visit their support forum at https://answers.netlify.com/t/support-guide-ssl-tls-certificate-provisioning/1300/82 to get help.