When sending message we get json response back from business page.

This error has been happening since 12/7 and works on retry so I don't think the information I'm sending to the API is wrong. I've implemented a retry logic to make this works for now but 400 errors are meant to be validation errors so they should not be retried.
Here's an example response : { "status_code": 400, "headers": { "content-type": "text/html; charset=utf-8", "access-control-allow-origin": "*", "date": "Mon, 16 Dec 2024 00:01:59 GMT", "proxy-status": "proxy_internal_response; e_isproxyerr=\"AcJqtYNsV56RM_ClZdul06xJtp6hKj65V0wolpxT6hfAbFn-Ls5eM03pjfBKhQ\"; e_proxy=\"AcIgARnOpoqwJqFXX2ZmV44esN1aWh3ytzDIHumfDl9yKgD2jGvxv2iBIs5-tdmSfiu-GTevlZz5fKrCtgHq\"; e_fb_binaryversion=\"AcKUyHFyg4iLKNRrkQsQEV8FYWZr3YRUdv0vKEKocr4iH7-HZ_4tJAG2uBa9oHBBlOGwFep4bj6X4e7zok_5MO9Lti8A7m0pLRc\"; e_fb_httpversion=\"AcKLWm1VhhNQtSWq7iuRWuD2AXlnxE3tQ-q-medDtJb4Fo8YhSEUaQ49CEwD\"; e_fb_hostheader=\"AcJhkmUHwvh77kOrbCIh02kPkn8rWGKDqKDjXbuvTpO02ziC7ZWBy71uB2NGzUo2dZxv_3prBkTgPIYz\"; e_fb_requesttime=\"AcIoxUZB-giTdG3DDqfzDdnTxeGVv77ivVT63gxuEJENsafEhwGlL6ZNuua5cngtP-hP8Cp45A\"; e_fb_responsebytes=\"AcIHdhfuqy2l3HIm5CXYR5VBJkWWgftBSghbROriZd5Yi7R5yylpY-3yBcQBkg\"; e_fb_requestsequencenumber=\"AcJPxLZZzb3Bh6fFI_VTRiipbPLXcEY5nlfvbbf_RvRJkQpzuU85QiQ6n6g\"; e_fb_proxycode=\"AcKL1rAciNkOi4XA9SPL6hcesDxl7O7s8sopq5HSMlljz0ZYJAVQV0l8rCgm\"; e_fb_builduser=\"AcIVqVDRsMoEU9vvYHejbzaA2vX-Hn-pVkLiTm5F-Zb_mlfdlgOgwS6WYujRJvrSMOE\"; e_fb_vipport=\"AcJ0hRdA6Su739kNd_ztxOw11JeGlnwFc3F_quw_ORrAfe6x1BhNJuBLRIwe\"; e_clientaddr=\"AcJMiP0Ef40xjcURmgAbL7EPxnPKX8Fg5qtg58yeKTfsu9uq5OQl5Serne2uNI_CvC8OGLzHfKRxESBGNZk6KaD_I-u1A5ddLvBSj9CAqI42CfiScg\"; e_fb_vipaddr=\"AcIXe6ylNGn-bb0IpxjjHKe3MtMWZse3uj8PlnMOWdcJpM2R-b7uGI8XPVu9nW2lYqNXQ0kOEICa_-8cocal_y0IOCqpqSw2mRQm\"; e_fb_configversion=\"AcKuUbCiPhSXMa-93FodVx4PqW0DMz4dpJluWe-1yM2LA8C1ABv0YErTDkPgnw\", http_request_error; e_proxy=\"AcKZ9rRgaxdInPviP7Ci-Fojgb7Vci_TwWYQOwuTZwW4vPKHIIs71M8TKIN3bncbnkBpmSbLXSYRqx1g\"; e_fb_binaryversion=\"AcIMuKVPuDybdqGcrY3b19nl4f62c0CP0qS5mTsg9G0W5TDtVdiD-wo_FhCx9PRDIN7POCC48Jl11dH2qETqliKCpP5Y7i9ByUk\"; e_fb_httpversion=\"AcJyAy3zVycleYkAvhFEbA9gnE6p1EqHvtUx2ZCW-a_DqWHfOdJhEPGv1Vy1\"; e_fb_responsebytes=\"AcK6zgw3X5uXnEE3ZyZvfMatRd_fevKqzmEQaxVnqVq1KrTC-N3u3emtbhMK-Q\"; e_fb_requesttime=\"AcI-Ieii7TxtDsmQ0BLHBsWqFNnKJtGFoAg01aLdMZZMNSVb9dshreaHlhoI0mGWIBJD30803w\"; e_fb_requesthandler=\"AcJculNZl-hqCHTBxodsfMcHgg_XGwZwJqTjBfIluix8q3LmyLBAYBrLGyPstRXuasJpbRLwDIw\"; e_fb_hostheader=\"AcKRCNNWVPSkXhYEGs4O4XBhf_3TcMa_AK8lu-NAJZuDws7H0CjinDjLnomCTCSrhsqwI58XSAdMeaTQ\"; e_fb_requestsequencenumber=\"AcKq_YmYb8wDznL72JUF5kKOhdimZ6OlNizpH64ahbWrDRDN_JPQ5-5Adw\"; e_upip=\"AcK9mXIUjkV8hN98aiLqrhrBmkPheNOCna7H55LvwW95BpCuAT8VXAYTRsWJN0442bNrFCU7kX_ay_C_tiaVugGdcp-TM9CLca_x\"; e_fb_builduser=\"AcLLaIZY_PRloGwTqKeDnOnr6y2JYyKBv6LvIkPzteOtRPIhIg94eBMJc_eNAlGkT4I\"; e_fb_vipport=\"AcLAY3Kus7l9H8jk6CORJn2Wj-RHH1Aiqj7qpnwYEs8OJYaqWlaH3Cm1x56a\"; e_clientaddr=\"AcIEw79nom_oz4FltypW9p_mt9mn41LQSPkVlEm8NgPSSw5AzfH6DBEI8x9Zxwloz_KiTl8DMML-ow\"; e_fb_vipaddr=\"AcL6F0WU3dN6ougoUj08N3hTFkV6DzArgobc0RxkdpGowLXpF4XwW2ddBII-9d3NPPCguA\"; e_fb_configversion=\"AcL2IP-f7OmOndIUie4q1JwyM5GFJOW0pxZe52K8XLcZq1ahVluykDhLij2Rkw\"", "x-fb-connection-quality": "EXCELLENT; q=0.9, rtt=12, rtx=0, c=10, mss=1380, tbw=3405, tp=-1, tpl=-1, uplat=59, ullat=-1", "alt-svc": "h3=\":443\"; ma=86400", "connection": "close", "content-length": "2959" }, "response": "\n

\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n

\n", "message": "API error" }
Does anyone one know why this could be happening?
Thanks, Guillaume

Integration Steps and Current Issue
App Configuration
App ID:
Permissions: business_management, ads_management, pages_read_engagement
API Version: v21.0
BOBO Relationship Creation
Endpoint: https://graph.facebook.com/v21.0//managed_businesses
Method: POST
Parameters:
existing_client_business_id:
access_token:
Result: Successful creation of partner relationship
System User Creation Attempt
Endpoint: https://graph.facebook.com/v21.0//access_token
Method: POST
Parameters:
scope: ads_management,pages_read_engagement
app_id:
access_token:
Result: Received an access token (CLIENT_BM_SU_ACCESS_TOKEN), but system user not created as expected
System User ID Retrieval Attempt
Endpoint: https://graph.facebook.com/v21.0/me
Method: GET
Parameters:
access_token:
Result: Empty object {} returned
Primary Issues
The system user is not being created under the client's Business Manager, despite receiving an access token.
Unable to retrieve system user ID due to empty object response from the /me endpoint.
Questions and Clarifications Needed
App Review:
Is app review mandatory for using these BOBO APIs?
If yes, what specific permissions or features need approval?
Are there interim solutions or test modes available during the review process?
System User Creation:
Why isn't the system user being created as described in the documentation?
Are there additional steps or permissions required for system user creation?
Debugging Assistance:
Are there specific debugging tools or techniques recommended for these issues?
Can you provide guidance on how to verify if the system user was actually created?
Additional Information
We've successfully created the BOBO relationship, but cannot proceed with asset assignment due to the system user creation issue.
All tokens (USERS_ACCESS_TOKEN, PARTNER_BM_ADMIN_SYSTEM_USER_ACCESS_TOKEN) have been obtained following the documentation.
We would greatly appreciate your assistance in identifying any missed steps or configurations that might be causing these issues. Our goal is to complete the BOBO integration successfully and manage client assets programmatically.

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