Hi,

I've gone through the onboarding wizard and at the end after I finish it on the /wp-admin/admin.php?page=wc-facebook page an XHR request is send:

GET https://graph.facebook.com/v25.0/fbe_business/fbe_installs?access_token=...&fbe_external_business_id=... and the response is 200 OK

After that another POST request is sent at https://graph.facebook.com/v25.0/xxx/access_token with payload:

access_token: "..."
app_id: "..."
fbe_external_business_id: "..."
scope: "manage_business_extension,business_management,ads_management,pages_read_engagement,catalog_management"

Bit it come back with 500 internal server error and the response is: {"error":{"code":1,"message":"An unknown error occurred","error_subcode":99}}

Do you know what's the issue here? I noticed it takes good time for the response to come back. The strange issue is I replicated the request payload with Postman and the response is 200 OK and I get the access_token...

WordPress Environment

WC Version: 10.8.1
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