Your customers or technicians may be seeing a DNS_PROBE_FINISHED_NXDOMAIN error message when they try to click on a link from an email.
This can happen if you need to set up DNS records to support SendGrid URL rewrites in your SendGrid account. There are a couple of ways to resolve this error:
Turn click tracking off in SendGrid, so it stops rewriting the URLs.
Fix the DNS issues for the domain being used by SendGrid for click tracking
If you need any assistance with this issue, you can reach out to SendGrid/Twilio support for help with your SendGrid account.