Issuing wildcard certificate with Cloudflare API and DNS-challenge

[kosmidt]

Within my OPNsense router running on it's own hardware I'm trying to issue a wild card certificate using the API of Cloudflare and a DNS challenge. It looks like the authentication is going well, but there are some errors during the process which prevent the challenge to be completed.

For example:
config file is empty, can not read SAVED_CF_Key
config file is empty, can not read SAVED_CF_Email

and a few lines further:
invalid domain

Are there any idea's how to solve this problem?

BTW, I've renamed my domain name and zone_id

<15>1 2023-01-06T19:42:26+01:00 router.mydomain.com acme.sh 65467 - [meta sequenceId="70"] [Fri Jan  6 19:42:26 CET 2023] d='*.mydomain.com'
<15>1 2023-01-06T19:42:26+01:00 router.mydomain.com acme.sh 75637 - [meta sequenceId="71"] [Fri Jan  6 19:42:26 CET 2023] _d_alias
<15>1 2023-01-06T19:42:26+01:00 router.mydomain.com acme.sh 80291 - [meta sequenceId="72"] [Fri Jan  6 19:42:26 CET 2023] txtdomain='_acme-challenge.mydomain.com'
<15>1 2023-01-06T19:42:26+01:00 router.mydomain.com acme.sh 87833 - [meta sequenceId="73"] [Fri Jan  6 19:42:26 CET 2023] txt='hpDONjemzJ0-DLwtKy7SogrdA5BVL7Qawxpbu-FFRFk'
<15>1 2023-01-06T19:42:26+01:00 router.mydomain.com acme.sh 91584 - [meta sequenceId="74"] [Fri Jan  6 19:42:26 CET 2023] d_api='/usr/local/share/examples/acme.sh/dnsapi/dns_cf.sh'
<15>1 2023-01-06T19:42:26+01:00 router.mydomain.com acme.sh 96489 - [meta sequenceId="75"] [Fri Jan  6 19:42:26 CET 2023] Found domain api file: /usr/local/share/examples/acme.sh/dnsapi/dns_cf.sh
<14>1 2023-01-06T19:42:26+01:00 router.mydomain.com acme.sh 20 - [meta sequenceId="76"] [Fri Jan  6 19:42:26 CET 2023] Adding txt value: hpDONjemzJ0-DLwtKy7SogrdA5BVL7Qawxpbu-FFRFk for domain:  _acme-challenge.mydomain.com
<15>1 2023-01-06T19:42:26+01:00 router.mydomain.com acme.sh 3929 - [meta sequenceId="77"] [Fri Jan  6 19:42:26 CET 2023] config file is empty, can not read SAVED_CF_Key
<15>1 2023-01-06T19:42:26+01:00 router.mydomain.com acme.sh 10187 - [meta sequenceId="78"] [Fri Jan  6 19:42:26 CET 2023] config file is empty, can not read SAVED_CF_Email
<15>1 2023-01-06T19:42:26+01:00 router.mydomain.com acme.sh 29613 - [meta sequenceId="79"] [Fri Jan  6 19:42:26 CET 2023] First detect the root zone
<15>1 2023-01-06T19:42:26+01:00 router.mydomain.com acme.sh 34367 - [meta sequenceId="80"] [Fri Jan  6 19:42:26 CET 2023] zones/289d*********************9022
<15>1 2023-01-06T19:42:26+01:00 router.mydomain.com acme.sh 44038 - [meta sequenceId="81"] [Fri Jan  6 19:42:26 CET 2023] GET
<15>1 2023-01-06T19:42:26+01:00 router.mydomain.com acme.sh 48306 - [meta sequenceId="82"] [Fri Jan  6 19:42:26 CET 2023] url='https://api.cloudflare.com/client/v4/zones/289d*********************9022'
<15>1 2023-01-06T19:42:26+01:00 router.mydomain.com acme.sh 53316 - [meta sequenceId="83"] [Fri Jan  6 19:42:26 CET 2023] timeout=
<15>1 2023-01-06T19:42:26+01:00 router.mydomain.com acme.sh 56910 - [meta sequenceId="84"] [Fri Jan  6 19:42:26 CET 2023] _CURL='curl --silent --dump-header /var/etc/acme-client/home/http.header  -L  --trace-ascii /tmp/tmp.hde4Wj2D '
<15>1 2023-01-06T19:42:28+01:00 router.mydomain.com acme.sh 63042 - [meta sequenceId="85"] [Fri Jan  6 19:42:28 CET 2023] ret='0'
<11>1 2023-01-06T19:42:28+01:00 router.mydomain.com acme.sh 68459 - [meta sequenceId="86"] [Fri Jan  6 19:42:28 CET 2023] invalid domain
<11>1 2023-01-06T19:42:28+01:00 router.mydomain.com acme.sh 73540 - [meta sequenceId="87"] [Fri Jan  6 19:42:28 CET 2023] Error add txt for domain:_acme-challenge.mydomain.com
<15>1 2023-01-06T19:42:28+01:00 router.mydomain.com acme.sh 77328 - [meta sequenceId="88"] [Fri Jan  6 19:42:28 CET 2023] _on_issue_err