Hey @ahmadihamid,
Your situation is similar to the one in this thread:
If we do the same investigation for pusri.co.id, we get:
$ dig caa pusri.co.id
...
;; QUESTION SECTION:
;pusri.co.id. IN CAA
;; ANSWER SECTION:
pusri.co.id. 86400 IN CAA 0 issue "digicert.com"
This says that only digicert.com can issue SSL certificates for this domain. So you’ll want to ask them if they will create a CAA record to allow Let’s Encrypt to create SSL certs as well since that’s who we use.