I contacted customer service and this is what I was told:
Connecting you to a Care Pro now.
Dipali G (Samsung Agent)(03-15-2018 12:29:30 AM)
Thanks for reaching in! I'll quickly go through the previous conversation.
Dipali G (Samsung Agent)(03-15-2018 12:29:30 AM)
Meantime, let me know the place of purchase (name of the country) of the device.
User (03-15-2018 12:29:48 AM)
USA
Dipali G (Samsung Agent)(03-15-2018 12:30:10 AM)
I see that you want to set the specific ringtone for the specific contacts.
User (03-15-2018 12:30:11 AM)
I have the S9 plus
Dipali G (Samsung Agent)(03-15-2018 12:30:15 AM)
What is the model number of phone? For non removable batteries, you can find it at rear panel of your mobile. For removable batteries, you can find it beneath the battery. Also you can try Menu>>Apps>>Settings>>About device>>Model Number. It generally starts with SGH, SCH, SPH or SM.
User (03-15-2018 12:30:53 AM)
SM-G965U
Dipali G (Samsung Agent)(03-15-2018 12:31:05 AM)
In S9 plus, we can not set specific ringtone for the specific contacts due to Oreo update.
User (03-15-2018 12:31:27 AM)
thats stupid...lol...is there going to be a fix for it?
Dipali G (Samsung Agent)(03-15-2018 12:32:10 AM)
I just want to make sure that I provide you accurate information. I do not want to misinform you.
Dipali G (Samsung Agent)(03-15-2018 12:32:30 AM)
Sure, I will take it as a feedback and forward it to the appropriate support team.
User (03-15-2018 12:32:45 AM)
It will let me set ringtones for calls, but not notification sounds for texts messages
Dipali G (Samsung Agent)(03-15-2018 12:32:50 AM)
I will file the reference ticket for you and will document all your concerns in details. Our dedicated department will go through the notes and help you with the needful.
Dipali G (Samsung Agent)(03-15-2018 12:32:50 AM)
Please help me with the following information to file the ticket for you:
Dipali G (Samsung Agent)(03-15-2018 12:34:20 AM)
Thank you for the information.
Dipali G (Samsung Agent)(03-15-2018 12:34:20 AM)
Could you give me a few minutes while I file the ticket for you?
User (03-15-2018 12:34:28 AM)
I need to be able to do that so I know when my boss is texting me versus random texts from apps and friends
Dipali G (Samsung Agent)(03-15-2018 12:35:01 AM)
Yes, I do understand your requirement.
Dipali G (Samsung Agent)(03-15-2018 12:37:11 AM)
I appreciate your time and patience.
Dipali G (Samsung Agent)(03-15-2018 12:37:26 AM)
I have created the ticket for you. The ticket number is: 1137387263.
Maybe if enough people complain and submit tickets it will be fixed faster?