I had to download the firmware from Sam mobile and to the install myself. It is very risky to do it if you don't fallow the directions. Once I did the update I have not had any issues on getting anymore security updates for my phone.
What software are you running i have a at&t s8+ and can,t receive ota update,s and no wifi calling and all three cricket at&t and samsung can,t seem to fix this they flashed my firmware to 9.0 pie at&t but i still can,t receive udates been i,m not on cricket firmware. All the issues but they still offer bring your own device and neglect to tell you this.