We had switched the names server of totum.com to Cloudflare Names servers. However, post propagation there were many DNS entries which are not resolved by Name servers. We reverted the name servers back to old Name servers. Now for troubleshooting using nslookup pointing to the nameservers provided those DNS entries are still not resolved. Attached is the screenshot taken for the same. You can see that totum.com works however, the entry alb-discount.service.prod.totum.com is not resolved this is one of the many records that are resolved by Cloudflare nameservers and the DNS page does show those entries. The third screenshot is for the entry that is present in Cloudflare DNS.