_, err = projects.NewOrganizationPolicy(p.ctx, "disallow_iam_external_domains", &projects.OrganizationPolicyArgs{
		Project:    pulumi.String(p.projectID),
		Constraint: pulumi.String("constraints/iam.allowedPolicyMemberDomains"),
		ListPolicy: projects.OrganizationPolicyListPolicyArgs{
			Allow: projects.OrganizationPolicyListPolicyAllowArgs{
				Values: pulumi.ToStringArray([]string{
					p.gcpCustomerID,
				}),
			},
		},
	})

Diagnostics:
  gcp:projects:OrganizationPolicy (disallow_iam_external_domains):
    error: gcp:projects/organizationPolicy:OrganizationPolicy resource 'disallow_iam_external_domains' has a problem: ExactlyOne: "list_policy.0.allow.0.all": only one of `list_policy.0.allow.0.all,list_policy.0.allow.0.values` can be specified, but `list_policy.0.allow.0.all,list_policy.0.allow.0.values` were specified.. Examine values at 'OrganizationPolicy.ListPolicy.Allow[0].All'.
    error: gcp:projects/organizationPolicy:OrganizationPolicy resource 'disallow_iam_external_domains' has a problem: ExactlyOne: "list_policy.0.allow.0.values": only one of `list_policy.0.allow.0.all,list_policy.0.allow.0.values` can be specified, but `list_policy.0.allow.0.all,list_policy.0.allow.0.values` were specified.. Examine values at 'OrganizationPolicy.ListPolicy.Allow[0].Values'.