Urgent: Why is my Index Exchange Header Bidding setup throwing 'bid timed out' errors constantly?

I'm completely stuck and incredibly frustrated with my header bidding setup, specifically with Index Exchange. I've been trying to integrate Index Exchange into my Prebid.js stack to improve our ad revenue, but it's been an absolute nightmare for the past two days. I feel like I'm banging my head against a wall.

The core problem is that despite following all the official documentation and countless tutorials, I'm consistently seeing 'bid timed out' errors specifically from the Index Exchange adapter. This is leading to abysmal fill rates and, consequently, significant revenue loss. It feels like I've tried everything under the sun, and nothing seems to work.

Here's what I've done so far to troubleshoot:

• Checked network latency extensively; our server response times are generally good.
• Reviewed and increased my Prebid.js timeout settings for the entire auction, even going beyond recommended values.
• Ensured all Index Exchange adapter parameters (site ID, etc.) are meticulously correct and match our account.
• Increased the global timeout in Prebid.js to give all bidders more time.
• Cross-checked for any ad blocker interference or browser extensions.

None of these steps have resolved the persistent timeouts. It's always Index Exchange. Here's a snippet from my console output that repeatedly shows the issue:

Prebid.js: Bid timed out for bidder: indexExchange (adUnit: /12345678/my-ad-unit-1) in 1200ms.
Prebid.js: No bids returned for ad unit: /12345678/my-ad-unit-1. Bidders: indexExchange.
Prebid.js: Bid timed out for bidder: indexExchange (adUnit: /12345678/my-ad-unit-2) in 1200ms.
Prebid.js: No bids returned for ad unit: /12345678/my-ad-unit-2. Bidders: indexExchange.

What are the most common pitfalls with Index Exchange header bidding timeouts? Are there any specific configuration parameters or network settings unique to Index Exchange that I might be overlooking, perhaps something related to their SSP integration? Any advanced debugging tips or insights into what could cause such persistent timeouts specifically from one adapter would be a lifesaver. I'm really desperate to get this working.

Thanks in advance for any insights or help!