Hello,
I believe your record has an incorrect syntax. It should be:
@ IN CAA <flag> issue <domain>
where <flag> is a number. Hence the complain from the tool that
character position 14 is not a valid number.
The line you used gives an error already when reloading the zone, with
the same message.
Can you please try the following:
@ IN CAA 0 issue "letsencrypt.org"
** Changed in: bind9 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1843551
Title:
dnssec-signzone: error when CAA record exists
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