ACME sign operation failed: The server could not connect to validation target

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My domain is: fccps.ru

I ran this command:
Try to use ACME to get cert for ExpressWay E cluster

It produced this output:
ACME sign operation failed: The server could not connect to validation target

My web server is (include version):
ExpressWay 12.7

The operating system my web server runs on is (include version):

My hosting provider, if applicable, is:

I can login to a root shell on my machine (yes or no, or I don’t know):
yes

I’m using a control panel to manage my site (no, or provide the name and version of the control panel):

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you’re using Certbot):
certbot 0.36.0

I have 2 Cisco ExpressWay configured as E. It in cluster with cluster name expwaye.fccps.ru
In DNS i have
expwaye.fccps.ru
connect.fccps.ru
join.fccps.ru
All record have same 2 ip’s

expwaye.fccps.ru. 3600 IN A 178.238.116.55
expwaye.fccps.ru. 3600 IN A 178.238.116.56

When I try to use clustername as CN I have a error
ACME sign operation failed: The server could not connect to validation target expwaye.fccps.ru

Can somebody helm me out

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