It is also available on secondary client interface:
https://www.universal-robots.com/how-tos-and-faqs/how-to/ur-how-tos/remote-control-via-tcpip-16496/ in SAFETY_DATA sub package 10 that is unfortunately not documented yet.
It’s in first 4 bytes of sub package.
This subpackage will be sent only if safety settings are actually applied to internal controller.
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