Unable to connect to my owncloud from app

Actual behaviour

I installed my owncloud server on linux machine with https://owncloud.xxxxxxxx.tk:10443 (freenom), when i connect via browser from my androidphone the site respond correctly, if i use android app it is not respond, if i instead insert in the app the ip instead of my registered name, it is respond correctly. if you see the dig of google dns the resolution is good.

alessandro@debian-z230:~$ dig @ owncloud.xxxxxxxx.tk

; <<>> DiG 9.16.13-Debian <<>> @ owncloud.xxxxxxxx.tk
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 40628
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

; EDNS: version: 0, flags:; udp: 512
;owncloud.xxxxxxx.tk. IN A

owncloud.xxxxxxx.tk. 3599 IN A 2.xxx.xx.xx7

;; Query time: 59 msec
;; WHEN: Tue Apr 13 20:14:48 CEST 2021
;; MSG SIZE rcvd: 65

Could you help me to understand why?

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