Broken for issuing new certificates

[amorgan1982]

Describe the bug
DNS TXT record is deleted and recreated during verification to Let's Encrypt Servers but changes do not refresh in Azure immediately.

Fix is to wait before validating for Azure DNS zone to update

        Thread.Sleep(10 * 1000);
        var validatedChallege = await dnsChallenge.Validate();

To Reproduce
Steps to reproduce the behavior. For Example:

Try to issue new cert.

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
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Additional context
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[chrismoseley]

Also just suddenly stated seeing this:

2023-06-21T21:09:53.366 [Information] Validating DNS authorization challenge. Can take up to 90 seconds...
2023-06-21T21:09:54.892 [Error] Unable to complete the processing for *.dev1.shinydev.co.ukCertes.AcmeRequestException : Fail to load resource from 'https://acme-v02.api.letsencrypt.org/acme/chall-v3/...'.urn:ietf:params:acme:error:malformed: Unable to update challenge :: authorization must be pending

The TXT record is created and accessible shortly after.