The button that is used to enter a realm code does not appear at all on Android, Windows 10, switch (screenshot included) and Xbox One. I do not have parental controls set up to block online multiplayer
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Cleaning up old tickets: This ticket has not been updated recently (~1 year+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.
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I don't know why it's not showing up for you, but I have the "Join Realm" button on both my Nintendo Switch and Windows 10, which brings up a screen to enter a realm code.