DDNS Afraid + WOW = WOW KO + error log

[BEF33]

Hello everyone,

I have got a NAS synology and a router Asus RT-AC88U with asuswrt-merlin
My DDNS synology was wrong for WOW my NAS.
So I used the guide DDNS Afraid for asuswrt-merlin of htpc guides
It was working well yesterday and today it goes wrong with error in the router log.
If I made a modification of the hostname, it works again but log errors remains....
More over it seems that the host name must not include number. and mine do.
So I think I'm going to try to create another one without number....
Could you please help me ?
FB

the router log:
Feb 16 16:30:02 kernel: /usr/sbin/acme-client: fc88u.ignorelist.com (freedns.afraid.org): bad domain syntax
Feb 16 16:35:00 rc_service: service 15491:notify_rc restart_letsencrypt
Feb 16 16:35:02 kernel: /usr/sbin/acme-client: fc88u.ignorelist.com (freedns.afraid.org): bad domain syntax
Feb 16 16:36:50 dnsmasq-dhcp[300]: DHCPREQUEST(br0) 192.168.110.105 45:10:b5:10:f4:78
Feb 16 16:36:50 dnsmasq-dhcp[300]: DHCPACK(br0) 192.168.101.102 45:08:b1:10:f4:78 Chromecast-Ultra
Feb 16 16:40:00 rc_service: service 15725:notify_rc restart_letsencrypt
Feb 16 16:40:02 kernel: /usr/sbin/acme-client: fc88u.ignorelist.com (freedns.afraid.org): bad domain syntax
Feb 16 16:45:00 rc_service: service 15955:notify_rc restart_letsencrypt
Feb 16 16:45:02 kernel: /usr/sbin/acme-client: fc88u.ignorelist.com (freedns.afraid.org): bad domain syntax
Feb 16 16:46:12 WLCEVENTD: eth2: Assoc 14:8G:3C:E2:C2:36
Feb 16 16:46:13 dnsmasq-dhcp[300]: DHCPDISCOVER(br0) 14:f9:c3:d1:d4:63
Feb 16 17:45:00 rc_service: service 19295:notify_rc restart_letsencrypt
Feb 16 17:45:10 kernel: /usr/sbin/acme-client: https://acme-v01.api.letsencrypt.org/acme/new-authz: bad HTTP: 429
Feb 16 17:45:10 kernel: /usr/sbin/acme-client: transfer buffer: [{ "type": "urn:acme:error:rateLimited", "detail": "Error creating new authz :: too many failed authorizations recently: see https://letsencrypt.org/docs/rate-limits/", "status": 429 }] (189 bytes)
Feb 16 17:50:00 rc_service: service 19540:notify_rc restart_letsencrypt
Feb 16 17:50:12 kernel: /usr/sbin/acme-client: https://acme-v01.api.letsencrypt.org/acme/new-authz: bad HTTP: 429
Feb 16 17:50:12 kernel: /usr/sbin/acme-client: transfer buffer: [{ "type": "urn:acme:error:rateLimited", "detail": "Error creating new authz :: too many failed authorizations recently: see https://letsencrypt.org/docs/rate-limits/", "status": 429 }] (189 bytes)
Feb 16 17:55:00 rc_service: service 19774:notify_rc restart_letsencrypt
Feb 16 17:55:20 kernel: /usr/sbin/acme-client: https://acme-v01.api.letsencrypt.org/acm...2682921773: bad response
Feb 16 17:55:20 kernel: /usr/sbin/acme-client: transfer buffer: [{ "type": "http-01", "status": "invalid", "error": { "type": "urn:acme:error:connection", "detail": "Fetching http://fc88u.ignorelist.com/.well-know...yKODFxmLMg: Timeout during connect (likely firewall problem)", "status": 400 }, "uri": "https://acme-v01.api.letsencrypt.org/acme/challenge/fwXj9eaZKg-7VYNs92zf77dw/12682921773", "token": "Ky1S5gXNiNFsyCT
Feb 16 18:00:01 rc_service: service 20029:notify_rc restart_letsencrypt
Feb 16 18:00:08 kernel: /usr/sbin/acme-client: https://acme-v01.api.letsencrypt.org/acme/new-authz: bad HTTP: 429
Feb 16 18:00:08 kernel: /usr/sbin/acme-client: transfer buffer: [{ "type": "urn:acme:error:rateLimited", "detail": "Error creating new authz :: too many failed authorizations recently: see https://letsencrypt.org/docs/rate-limits/", "status": 429 }] (189 bytes)