Resolve case / Assign to are not actionable in case managmenet

Hello,

We are facing an issue in Oracle Case Management.

On the Case Management Landing Page, the Assign To button is not actionable.
Also, on the Case Details page, from the Action Bar, the Resolve Case action is not working. it was working fine on 25D Upgrade.

Has anyone faced a similar issue before, or is there any configuration or privilege that should be checked for these actions?

Thanks.