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: