So, I am having the same issue. I contacted Verizon on the same day the update came out. The first time I spoke with the customer support rep, we spent about an hour getting access to my phone and changing different settings. He then proceeded to tell me the Note 10 was not a supported device until I gave him the update URL. Well, then he told me to contact Samsung and call me back in 30 minutes. I just happened to be on the phone with Samsung when the rep called me back, so I conferenced him in. Samsung told him it was a Verizon issue and explained why and the rep admitted it. We hung up with Samsung and went through another test, including one where I had to dial a *#*#476#+#*, or something like that, but it wasn't acting as expected. He said to call back since Tier 2 was closed at that time and he would leave notes. I called the next day and was connected with a Teir 2 rep. I told her that there should be notes on my account. She said the only note she saw was a text sending me a number to Samsung support. We went through the whole process again. After about an hour and a half, she discovered that there was some missing "file" that she was trying to push but was having issues and she didn't know why. She told me she would put a ticket in with technical support (who knows‽) and would call me back when they resolved the issue. I waited until yesterday and called back. I told the rep the situation and she was not very helpful. She said she read some of the notes and then told me it was a Samsung issue because it was a Samsung app... blah, blah, blah. Every time I tried to explain the situation to her, she would tell me that it was a Samsung app and they couldn't do anything about it and how she had a Note 10 and she didn't have it either.
Anyways, there is probably not a lot of incentive to fix it. I would be curious how many people still use the Note 10 AND would even know and/or look care about advance messaging or RCS.
