I am seeing the exact same issue here (please note that I have changed the domain name and IP Address to protect the innocent):
2021-07-18 00:39:11,362 (INFO) wo : Initializing WordOps Database
2021-07-18 00:39:11,395 (DEBUG) wo.core.logging : 'Namespace' object has no attribute 'web'
2021-07-18 00:39:11,396 (INFO) wo : Certificate type : domain
2021-07-18 00:39:11,397 (DEBUG) wo.core.logging : Running command: /etc/letsencrypt/acme.sh --config-home '/etc/letsencrypt/config' --list --listraw
2021-07-18 00:39:11,580 (DEBUG) wo.core.logging : Command Output: Main_Domain|KeyLength|SAN_Domains|CA|Created|Renew
example.com|"ec-384"|www.example.com|LetsEncrypt.org||
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Command Error:
2021-07-18 00:39:11,580 (DEBUG) wo.core.logging : Writing content in /var/lib/wo/cert.csv
2021-07-18 00:39:11,580 (DEBUG) wo.core.logging : Changing permission of /var/lib/wo/cert.csv, Perm:384
2021-07-18 00:39:11,581 (DEBUG) wo.core.logging : Validation : Webroot mode
2021-07-18 00:39:11,581 (DEBUG) wo.core.logging : Changing ownership of /var/www/html/.well-known, Userid:33,Groupid:33
2021-07-18 00:39:11,582 (DEBUG) wo.core.logging : Changing permission of /var/www/html/.well-known, Perm:488
2021-07-18 00:39:11,582 (INFO) wo : Validation mode : Webroot challenge
2021-07-18 00:39:11,583 (INFO) wo : Issuing SSL cert with acme.sh
2021-07-18 00:39:11,583 (DEBUG) wo.core.logging : Running command: /etc/letsencrypt/acme.sh --config-home '/etc/letsencrypt/config' --issue -d 'example.com' -d 'www.example.com' -w /var/www/html -k "ec-384" -f
2021-07-18 00:39:22,765 (DEBUG) wo.core.logging : Command Output: [Sun Jul 18 00:39:12 UTC 2021] Using CA: https://acme-v02.api.letsencrypt.org/directory
[Sun Jul 18 00:39:12 UTC 2021] Multi domain='DNS:example.com,DNS:www.example.com'
[Sun Jul 18 00:39:12 UTC 2021] Getting domain auth token for each domain
[Sun Jul 18 00:39:16 UTC 2021] Getting webroot for domain='example.com'
[Sun Jul 18 00:39:16 UTC 2021] Getting webroot for domain='www.example.com'
[Sun Jul 18 00:39:17 UTC 2021] Verifying: example.com
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Command Error: [Sun Jul 18 00:39:20 UTC 2021] example.com:Verify error:Invalid response from https://example.com/.well-known/acme-challenge/ka7esJ-NIPEoJ8svWkJLLob0wHr0kslsIESoeldIdGk [303.316.333.349]:
[Sun Jul 18 00:39:20 UTC 2021] Please add '--debug' or '--log' to check more details.
[Sun Jul 18 00:39:20 UTC 2021] See: https://github.com/acmesh-official/acme.sh/wiki/How-to-debug-acme.sh
2021-07-18 00:39:22,765 (INFO) wo : Issuing SSL cert with acme.sh
2021-07-18 00:39:22,767 (ERROR) wo : Your domain is properly configured but acme.sh was unable to issue certificate.
You can find more informations in /var/log/wo/wordops.log