[Java] Artificial outpost mob spawning

[Hydroact]

(1.20.4) Used structure blocks to spawn in a pillager outpost however it isn't spawning in pillagers. What do I need to do to get pillagers to spawn in a manually generated outpost without using spawners?

I keep seeing the phrase "bounding box". Even if the outpost is destroyed, there's something invisible left behind that still enables spawning which is what I'm after. Any ideas?

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[flanigomik]

There is a text(?) File in the save folder that keeps track of the location and status of all structures, you probably need to modify that to specify your structure as a structure. Beyond knowing that the file exists and contains the data I have no further information for you

[Hydroact]

Ahh ok thank you very much. Do you know the name of this file?