Fastpanel certificate error

Hello please i need help. When ever i tried to issue NORMAL ssl certificate in FASTPANEL CONTROL PANEL i got the below error from LET'S ENCRYPT. but wildcare certificate works.

=================================================================
Certificate 'mix.linkpc.net' can not be issued as URL 'http://mix.linkpc.net/.well-known/acme-
challenge/FzlAElYklYY458TBWjXU' is not available for verification. Received response is '', expected response was 'FzlAElYklYY458TBWjXU' 
=================================================================

Please how can i resolve this error?

Are there any channels from:

I doubt you will find much help here for such a specific problem.
That is, the problem seems to be within the panel itself - not LE.

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Hi @donsicilly,

Using the online tool Let's Debug yields these results, indicating DNS issues.
https://letsdebug.net/mix.linkpc.net/1789835

DNSLookupFailed
FATAL
A fatal issue occurred during the DNS lookup process for mix.linkpc.net/A.
DNS response for mix.linkpc.net/A did not have an acceptable response code: SERVFAIL
DNSLookupFailed
FATAL
A fatal issue occurred during the DNS lookup process for mix.linkpc.net/AAAA.
DNS response for mix.linkpc.net/AAAA did not have an acceptable response code: SERVFAIL
NoRecords
FATAL
No valid A or AAAA records could be ultimately resolved for mix.linkpc.net. This means that Let's Encrypt would not be able to connect to your domain to perform HTTP validation, since it would not know where to connect to.
No A or AAAA records found.

Also for DNNSEC there are a lot of issues as well mix.linkpc.net | DNSViz

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