No CAA record on moph.go.th (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.
moph.go.th. 0 IN CAA 0 issue "sectigo.com"
moph.go.th. 0 IN CAA 0 issue "godaddy.com"
moph.go.th. 0 IN CAA 0 issue "globalsign.com"
moph.go.th. 0 IN CAA 0 issue "digicert.com"