Hi, I have website with let’s encrip ssl sertificate when connect in site with mobile app (use iOS 12.0.1) have problem with opening tickets with this error:
Ashlamashki osTicket doesn't have a mobile app - all the ones that are available in the Play/app store are unofficial. You'd need to ask the developer of the app for support here I'm afraid.
Ashlamashki @RBGE is correct. There is no official osTicket mobile app. Last I checked all of them required modding osTicket to work.