NPC dialogue appears when the player first enters the server/world

[vale gyro]

My Command :

In chat :
/scoreboard objectives add firstJoin dummy

Command Block :

(Repeating, Always Active)

execute as @a[scores={firstJoin=0..0}] ~ ~ ~ dialogue open @p popup (my npc name)
(Chain, Conditional, Always Active)

scoreboard players set @a[scores={firstJoin=0..0}] firstJoin 1
(Chain, Conditional, Always Active)```

I haven't tested it yet..

NPC dialogue appears when the player first enters the server/world

[ashen pier]

that should work

its probably better to use tags

[vale gyro]

Like..

/tag @e[type=npc] add popup

[ashen pier]

yeah

also, instead of adding the tag after triggering the dialogue popup

make it the exit command

that makes it more reliable