The other party has enabled friend verification
You need to send a verification application, and only after the other party passes it can you add them as friends.
——If I disappear one day, will you search for me all over the world?
Message sent
I received a new message on my phone requesting to add a new friend.
——Okay, wait for me
Intention: I am waiting for you at the place where we first met, do you still remember?