The Prince Beimo said the title was assigned incorrectly, and the court officials of Nanliang did not suspect anything, agreeing to make the correction; it wasn't a significant effort.
The crucial point was that Princess Jing Mountain was already in Nanliang, practically belonging to the Prince of Nanliang, and even carrying a pregnancy. The raw rice had already been cooked, what could Beimo do?
This marriage certificate was just a formality to make this "privately determined lifelong relationship" proper and above board.
The marriage certificate comes in two copies.
The Prince Beimo sealed it, and the Nanliang envoy took it to the Emperor of Nanliang to affix the Jade Seal, then returned it.
Prince Beimo had been worried Nanliang would find something amiss, but nothing happened, it was a false alarm.
