Hi AH,
I think when activating the role one must pass the user's own object Id, rather than that of an AAD group the user may belong to.
So at this step (below snap) if you are giving your group name/id then please change it to your individual object ID and try
Please check this for more ref https://learn.microsoft.com/en-us/entra/id-governance/privileged-identity-management/pim-resource-roles-assign-roles
Kindly accept answer if it helps , Thanks