No CAA record on asus.com (wildcard=false) contains the issuance domain "letsencrypt.org". You must either add an additional record to include "letsencrypt.org" or remove every existing CAA record. A list of the CAA records are provided in the details.
asus.com. 0 IN CAA 0 issue "globalsign.com"
CAA records control authorization for certificate authorities to issue certificates for a domain
asus.com. 0 IN CAA 0 issue "globalsign.com"
A and AAAA records found for this domain
de.store.asus.com. 0 IN A 35.156.230.130
de.store.asus.com. 0 IN A 18.196.8.255
The IANA public suffix is the TLD of the Registered Domain
The TLD for de.store.asus.com is: com
The current status.io status for Let's Encrypt
Operational