Can you turn on texture packs in Minecraft on realm that is not yours?

I'm Samy an independent advisor. Welcome to the community. How are you?

I believe this answers your question, mate.

Can I host my Realms Plus worlds, texture packs, skins, and mash-ups on my Realm?

Yes. You can upload any worlds, texture packs, skins, and mash-ups from the Realms Plus catalog or your purchases from the Minecraft Marketplace to your Realm and invite your friends to join for free.  

Thank you for the reply Jasmine,

This texture pack is on my child's account, I can PM you details if needed. Some other relevant information that may assist in a solution:

• The texture pack says "owned" in the Minecraft Store Page
• The realm is paid from that account
• The texture pack has worked on the Realm previously (until now), since the realm was started by the child account

Having checked the link you provided, I actually don't see the texture pack on either my or my child's account, that's odd, surely it has to be somewhere?

Thanks Again,

H.D.Tony

If you're having trouble accepting invites or joining Realms, be sure that you are not using a modded game client, and are not using a resource pack that does not contain textures for the Realm buttons. If you are, switch to the standard Minecraft
game client, click Options, click Resource Packs, then return to the default.

Thank you for contact us! I'm Anderson, an Independent Consultant and a Microsoft user like you.

Good evening

The reason for this is that Minecraft texture packs are usually downloaded as .zip or .rar files, not .jar files. It's possible that the file you downloaded is not actually a texture pack, or that it was downloaded incorrectly.

To open a Minecraft texture pack in the Java edition, you should follow these steps:

Download the texture pack from a trusted website, such as the official Minecraft website or a reputable modding website.

Once the file has downloaded, open the Minecraft launcher and click on "Options" and then "Resource Packs".

Click on "Open Resource Pack Folder". This will open the folder where your Minecraft resource packs are stored.

Move the downloaded texture pack file into the folder.

In the Minecraft launcher, click on "Done" and then go back to the "Resource Packs" section.

You should now see the new texture pack in the list of available resource packs. Click on it to select it, and then click "Done".

The texture pack should now be applied to your game.

You can fix it by downloading the world and replacing the realm with the downloaded version. Just make sure if you are using any texture packs you reupload it with your world!