Your admin id is listed in the config.php file as undeletable. This also means it's un-editable. You will have to edit your config.php file and either remove the admin id you're renaming, or replace it with the secondary admin id.
You find your userid by searching for your username in the acp. It's at the very top.
You could also add your admin id back to config.php after you rename yourself (recommended).
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