Why is the third beacon not working in MInecraft?

two beacons work, but the third does not. What do I have to do, or why do two go?

Put an iron block in one corner, maybe it will work then?

What is that supposed to help?

Take the beacon off and on again

Maybe the same with the iron blocks

Because it should work lol

To be honest, I don't know either, but it's the only plausible explanation, the rest is good.

There's a block somewhere above the beacon. There must be free up to the construction height.

500 IQ

I also needed something to come up with it.

1000000 IQ

That was actually the reason. Actually, I had looked, but I had forgotten to dismantle one block.

Has happened to me too.

Please ^^