How to tell an alt account of discord

So i got kicked from a discord server it was my fault but anyways I made a new account the next day and joined that server again on that account. I said “hello” and within moments i was kicked again how did they know it was the same person and not kicking an actual new person?

probably IP?

I don’t think the users IP addresses are visible to Discord , maybe to the people who admin all the discords but say your guild master of a guild who runs the discord , I don’t think they have access to it.