Setting cookies is done via HTTP headers. This means you can’t set any cookies via serverside methods (PHP->WordPress) anymore after any content has been sent to the browser.
A working example of setting cookies in WordPress (in one of my plugins):
Cookie Manager: https://github.com/download-monitor/download-monitor/blob/e26022f9a96abf174a874873b8cd35a0db98882b/includes/class-dlm-cookie-manager.php
Setting the actual cookie: https://github.com/download-monitor/download-monitor/blob/e26022f9a96abf174a874873b8cd35a0db98882b/includes/class-dlm-download-handler.php#L416
The cookie is set on the hook parse_request which is triggered after init so this probably isn’t the issue in your case. Make sure there is no content send to the browser prior to your setcookie call.
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