Pushground API Bid Update Failure: CPC Optimization Request Returns 400 Bad Request on Specific Campaigns

I'm encountering a persistent issue when attempting programmatic CPC optimization via the Pushground API for certain campaign types.

Specifically, POST /api/v1/campaigns/{campaignId}/bids consistently returns a 400 error despite valid JSON payloads for other campaigns. Here's the console output:

HTTP/1.1 400 Bad Request
Content-Type: application/json

{
  "error": "Invalid bid update request for campaign type 'NativePush'. Max bid must be > 0.005 and <= 0.5 for this region."
}

I've verified the payload structure and regional bid constraints, yet it persists. Any insights on this specific Pushground API behavior would be greatly appreciated. Help a brother out please...