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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`InvalidModel` when updating Access Package Assignment Policy","articleBody":"### Describe the bug\n\nI want to update an access package assignment policy, but whenever the policy includes the requirement for approval (i.e. `is_approval_required_for_add=True`), this fails with an `InvalidModel` error. \n\n**Example**:\nIf I set the property for \"requires approval\" to false, I am able to retrieve an existing access package policy by ID and update a certain property (e.g. the duration) successfully: \n\n```\n\n# Retrieve the pre-existing access package assignment policy:\nap_assignment_policy_obj = await graph_client.identity_governance.entitlement_management.assignment_policies.by_access_package_assignment_policy_id(\u003cap_pol_id\u003e).get()\n\n# Set the required duration in ISO 8601 duration format:\nap_assignment_policy_obj.expiration.duration = \"PT4H\"\n        \n# Update the access package assignment policy:\nresult = await graph_client.identity_governance.entitlement_management.assignment_policies.by_access_package_assignment_policy_id(\u003cap_pol_id\u003e).put(ap_assignment_policy_obj)\n\n```\n\nHowever as soon as \"requires approval\" is set to true (and the associated approval groups etc. are set), I am no longer able to update an existing access package assignment policy. Instead, the following error is encountered:\n\n```\nmsgraph.generated.models.o_data_errors.o_data_error.ODataError: \nAPIError\nCode: 400\nmessage: None\nerror: MainError(additional_data={}, code='InvalidModel', details=[], inner_error=InnerError(additional_data={}, client_request_id='', date=datetime.datetime(2025, 6, 12, 12, 57, 48), odata_type=None, request_id=''), message='The model is invalid.', target=None)\n```\n\n\n### Expected behavior\n\nRegardless of whether or not approval is required (as dictated by the property `is_approval_required_for_add`), the access package policy update should work.\n\n### How to reproduce\n\n1. Create an access package assignment policy\n2. Set \"requires approval\" to true, and fill in the required properties\n3. Try to update the access package assignment policy\n\n### SDK Version\n\n1.33.0\n\n### Latest version known to work for scenario above?\n\n_No response_\n\n### Known Workarounds\n\n_No response_\n\n### Debug output\n\n\u003cdetails\u003e\u003csummary\u003eClick to expand log\u003c/summary\u003e\n\n```\n\nmsgraph.generated.models.o_data_errors.o_data_error.ODataError: \nAPIError\nCode: 400\nmessage: None\nerror: MainError(additional_data={}, code='InvalidModel', details=[], inner_error=InnerError(additional_data={}, client_request_id='', date=datetime.datetime(2025, 6, 12, 12, 57, 48), odata_type=None, request_id=''), message='The model is invalid.', target=None)\n\n```\n\u003c/details\u003e\n\n\n### Configuration\n\n_No response_\n\n### Other information\n\nAn example of the approval settings that can be used to generate this error is shown below:\n\n``` \n\nfrom msgraph.generated.models.access_package_assignment_approval_settings import AccessPackageAssignmentApprovalSettings\nfrom msgraph.generated.models.access_package_approval_stage import AccessPackageApprovalStage\n\nap_assignment_policy_obj. request_approval_settings = AccessPackageAssignmentApprovalSettings(\n        is_approval_required_for_add = True,\n        is_approval_required_for_update = False,\n        is_requestor_justification_required = True,\n        stages = [\n                AccessPackageApprovalStage(\n                    duration_before_automatic_denial = datetime.timedelta(days=14), \n                    is_escalation_enabled = False,\n                    is_approver_justification_required = True,\n                    duration_before_escalation = datetime.timedelta(0),\n                    primary_approvers = [\n                        GroupMembers(\n                            odata_type = \"#microsoft.graph.groupMembers\",\n                            description = \"approver_group\"\n                        )\n                    ],\n                    fallback_primary_approvers = [],\n                    escalation_approvers = [],\n                    fallback_escalation_approvers = []\n                )\n        ]\n)\n```","author":{"url":"https://github.com/sandra-bee","@type":"Person","name":"sandra-bee"},"datePublished":"2025-06-12T13:19:34.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/1258/msgraph-sdk-python/issues/1258"}