WFM Schedule Publish Fails with 403 Forbidden Due to Overly Strict IAM Policy

My current config is completely failing… we are hitting a wall with our weekly schedule publish in genesys cloud. the environment is set to us-east-1, and our team operates on central time. every tuesday at 6 am cst, the wfm integration attempts to push the new roster via the api, but it consistently fails with a 403 forbidden error.

the specific endpoint causing the issue is /api/v2/wfm/schedules. the error payload returns error_code: "permission_denied" with the message "the provided oauth token does not have the required scope: wfm:schedule:write".

here is the setup:

  • sdk version: genesys cloud sdk v6.1.0 (python)
  • iam policy: we created a custom role wfm_scheduler that explicitly grants wfm:schedule:read and wfm:schedule:write. however, we also applied a strict compliance constraint that restricts write access to ip ranges 10.0.0.0/8 and 192.168.1.0/24.
  • execution context: the publish job runs on an aws lambda function. the lambda’s security group allows outbound traffic, but the source ip is dynamic.

i suspect the ip restriction in the iam policy is blocking the lambda’s ephemeral ip, even though the token itself looks valid when tested in postman from a static ip.

we need to maintain compliance with our security audit requirements, so opening up the ip range to 0.0.0.0/0 is not an option. is there a way to whitelist specific aws lambda execution environments or vpc endpoints in the genesys cloud iam policy? or should we be using a different authentication method for automated wfm tasks?

any insights on how other mid-sized contact centers handle this balance between automated wfm publishing and strict network-level security controls would be appreciated. we are trying to avoid manual intervention every week, which defeats the purpose of the automation.