"Jeb_" not working on sheep.

It's working perfectly fine for me. Tested naming a spawn egg as well as naming an already spawned sheep.

You wrote "Jeb_" with a uppercase "J" that doesn't trigger the easter egg, it should be "jeb_" with a lowercase "j".

It will not work with a capital J, must be a lower case J. Is that the issue?

it must be just

jeb_

for the easter egg to work

No longer working on Bedrock. Photos show before and after quitting the game and restarting the console.

jeb_ is the required name.