How can I get the heads to work on version 1.15?

[Zanarah]

Hello there,

I just recently restarted playing minecraft and was very surprised by the changes.
Some years ago I used these heads in minecraft, but I can't get them to work on minecraft 1.15.
Can you please help me?

Yours Zanarah

[Kiaria]

Hello there,

I just recently restarted playing minecraft and was very surprised by the changes.
Some years ago I used these heads in minecraft, but I can't get them to work on minecraft 1.15.
Can you please help me?

Yours Zanarah

Hello, Zanarah,
Are you using the givecode under the label "Minecraft 1.13+" on the head pages?
Are you in Java MC?
Are you using a command block to summon the head with the give code and NOT the chat?