How to use TrustedUUID?

For a while, I have been experimenting with NBT Data on Minecraft. Recently, I wanted to make a fox that trusts both me and a friend of mine, and I know this is possible, as they have the tag TrustedUUID.

However, I don't know how to use it. There are no tutorials about using this tag, and the Wikipedia, while mentioning it, does not give a good explanation. How can I use this to make a fox that trusts me and my friend?

I have tried to use only my friend's UUID, which did not work. I saw something about "M" and "L," but do not know how to use them. Is there any possible way to do this?

You have to get your UUIDMost and UUIDLeast.

To get those, use a website like http://mapmaking.fr/uuid/ or any other website that can show your UUID with UUIDMost and UUIDLeast.

For example if you search me up (EpicProKillerFTW), you would see 3 things.

UUID: 4d05a07a36ad4bc4854217220ba9a219

UUIDMost: 5550018562567785412

UUIDLeast: -8844481283210239463

Once you get those, you can get your fox to be trusted by you and your friend using the Data Merge command:

/data merge entity <the fox's UUID> {
    TrustedUUIDs:[
    {
       L: <your UUIDLeast>L, 
       M: <your UUIDMost>L
    }, 
    {
       L: <your friend's UUIDLeast>L, 
       M: <your friend's UUIDMost>L
    }]
}

What the Data Merge command should look like:

/data merge entity 06de3220-88ae-4cf8-9f40-55135415a6b7 {TrustedUUIDs:[{L: -8844481283210239463L, M: 5550018562567785412L}, {L: -6334564698302257369L, M: -8038687027037716246L}]}

Alternatively, you can use the Summon command:

/summon fox ~ ~ ~ {
    TrustedUUIDs:[
    {
       L: <your UUIDLeast>L, 
       M: <your UUIDMost>L
    }, 
    {
       L: <your friend's UUIDLeast>L, 
       M: <your friend's UUIDMost>L
    }]
}

What the Summon command should look like:

/summon fox ~ ~ ~ {TrustedUUIDs:[{L: -8844481283210239463L, M: 5550018562567785412L}, {L: -6334564698302257369L, M: -8038687027037716246L}]}

Do note that you need to have the L at the end of the UUID.

It only works with 2 people, you and your friend. If you want others, then it won't work. I've tried it but only lets you have 2 TrustedUUIDs.

I hope this helped.