Designer SSO Stopped Working 8.1.17

Just did the 8.1.17 update from 8.1.15 and designer SSO stopped working across multiple gateways. Windows gateway and client environment, been using designer SSO with no issues for many years. I don’t see anything specific in the release notes, perhaps this is a regression?

It seems to be intentional:

Woops, did not scroll down far enough to find this post. Sorry and thanks!

It seems to be enabled with:
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