Do you find my mistake with my MineCraft Command?

Is a little bit because I've asked something here, but you are my last hope until Saturday to get this command to run '

/ give @p spawn_egg 1 0 {EntityTag: {id: "minecraft: horse", Variant: 1028, Glowing: 1, Health: 999, Attributes: [{Name: "generic.maxHealth", Base: 999}, {Name: "generic.movementSpeed", Base: 0f}], ArmorItem: {id: golden_horse_armor}, Tame: 1, ActiveEffects: [{Id: 10, Amplifier: 0, Duration: 2147483647}, {Id: 11, Amplifier: 0 , Duration: 2147483647}]}}

This command is meant to create a horse spawnegg (must be an item so I can copy it to a server via a safe bar).

This horse should permanently have the glowing effect, be as good as immortal and can't move. But you have to be able to move it by hand. In addition, it should always spawn as a black horse (but need the same Spawnegg as a white horse). The saddle and the golden horse armor serve only as decorative elements.

Issues: These horses serve as flags of a Capture the Flag mini-game on a server. Because of the complex technique but only adult horses can spawn. The saddle and the horse armor are also not displayed.

(Java version 1.12.2)

Rescue Me! XD

You have to add Age: 0.

To all who read that later: The, Age: 0 you have to insert directly after the Variant: 1028, at the very end of the command it does not work.