This bug . Clean deployments do not experience this issue.
- Install AM 5.5.1
- Upgrade this instance to AM-6.0.0
- Login to AM
- Create a rest STS instance e.g OPENAM->SAML
- This fails always with
Using REST directly looks to be a valid workaround.
Note the REST STS UI is different from AM 6.x compared to an upgraded AM 6.x
upgraded AM 6.x