I want to integrate a Let’s Encrypt certificate via FreePBX, but I allways get the following error:

LetsEncrypt Generation Failure
Unable to update challenge :: authorization must be pending

Processing: voip.uni-wh.de, Local IP:, Public IP:
Self test: trying http://voip.uni-wh.de/.freepbx-known/fcdabf7a89967f5960808b52b315ef43
Self test: received fcdabf7a89967f5960808b52b315ef43
Getting list of URLs for API
Requesting new nonce for client communication
Account already registered. Continuing.
Sending registration to letsencrypt server
Sending signed request to https://acme-v02.api.letsencrypt.org/acme/new-acct
Account: https://acme-v02.api.letsencrypt.org/acme/acct/213239210
Starting certificate generation process for domains
Requesting challenge for voip.uni-wh.de
Sending signed request to https://acme-v02.api.letsencrypt.org/acme/new-order
Sending signed request to https://acme-v02.api.letsencrypt.org/acme/authz-v3/40102561150
Got challenge token for voip.uni-wh.de
Token for voip.uni-wh.de saved at /var/www/html/.well-known/acme-challenge/BYsR52eki6IgJCMzcJ63lSC-9uKFQZpArKG_Db9k4Jo and should be available at http://voip.uni-wh.de/.well-known/acme-challenge/BYsR52eki6IgJCMzcJ63lSC-9uKFQZpArKG_Db9k4Jo
Sending request to challenge
Sending signed request to https://acme-v02.api.letsencrypt.org/acme/chall-v3/40102561150/Oa0Naw
Verification pending, sleeping 1s
Sending signed request to https://acme-v02.api.letsencrypt.org/acme/chall-v3/40102561150/Oa0Naw

Any idea, what I can do to solve this problem?
Certificate Manager version: 15.0.48, FreePBX

Thank you

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