Hi truskcr,
Try this:
1. Get your local admin password.
Go to developer.servicenow.com, sign in, find your instance and use the action menu to reset the instance password.
2. Reach the login page, bypassing SSO.
In a logged-out / incognito browser window, go to:
https://dev400129.service-now.com/side_door.do
This skips the SSO redirect and shows the normal ServiceNow login. Sign in with user "admin" and the password from step 1. (If side_door doesn't load the login, try https://dev400129.service-now.com/login.do instead.)
If the side door just bounces you to a "session timed out" / logout screen:
That happens when auto-redirect is still forcing you out. In that case you can disable SSO directly through the REST API, which is NOT affected by the browser redirect. Using Basic Auth with your admin credentials.
Set glide.authenticate.multisso.enabled sys_property to false.
For next time: before enabling SSO, set up an Account Recovery user under Multi-Provider SSO. That is your break-glass access if the IdP ever breaks again.
Hope this gets you unblocked.
