Also, you have a 2019 version of both of your licenses. Unless you have a reason to stay with 2018, you could install 2019 and use the later license. Maybe you are already trying your later license on 2018? If the serial number starts with a U, that’s your 2019 license.
We purchased 2018 version & have licence of the same, i.e. why using 2018, I also tried searching 2019 version, it’s not available, if you have link of 2019 version please share.