Cannot curl -I http://pi.hole/admin/index.php

When I run the command I get
curl: (6) Could not resolve host: pi.hole
I also get xheader could not be retrived
any advice?

Please do not revive two-year-old topics (for entirely different Pi-hole versions back then) with posts that are only related by the command used, but poduce an entirely different outcome.
I've split your post into a new topic.

If you ran that curl from your Pi-hole machine:
Check what your Pi-hole host is using as DNS server and adapt as required.

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