google cloud platform – GCP Owner and Administrator roles for organization

I am assigned “Owner” role on the whole GCP organization, yet I cannot access organization IAM or billing accounts.
I’ve tried running a query on principal, I can see my account as a member of “roles/owner” role, but still nothing. Is it a bug or is it really intended do be so that owner role has less permissions than resourcemanager.organizationAdministrator? Thanks!