DNS01: How is the challenge supposed to be formatted?

Hi @funilrys

that's wrong. Checked your domain ( https://check-your-website.server-daten.de/?q=test.juris-sb.de ), the result:

Domainname TXT Entry Status ∑ Queries ∑ Timeout
test.juris-sb.de ok 1 0
_acme-challenge.test.juris-sb.de UJICsxiz22UlY8z6KXPR5Xph61ApwN36A10JaF0nVuE.Y-ETMP1lasSBSfpx-W8r15Vj4H1psxxfij91tOWeQkw missing entry or wrong length 1 0

See my own domain:

Domainname TXT Entry Status ∑ Queries ∑ Timeout
server-daten.de v=spf1 a mx ?all ok 1 0
www.server-daten.de ok 1 0
_acme-challenge.server-daten.de LJWtQAv_5lFCjGdssk4B2pyYoan8xRT7P8t1Bhvy4VU looks good 1 0

These entries have always 43 characters.

Key authorization -> SHA256 Hash -> Base64 -> Base64Url

Not the raw key authorization.