I’ve been having several issues lately with my A-Z claims getting denied. Need advice.

Been selling on Amz for 10+ years. I always use Amz Buy Shipping. My process with A-Z claims for “lost” items has always been to inform Amazon that I shipped using Amz Buy Shipping, provide tracking and show delivery, etc. All of these orders were shipped on time, tracking uploaded on time and delivered on time. I also respond to the A-Z claims within 24 hours. This has ALWAYS worked, and Amazon covers the cost of the refund and doesn’t count the claim against my ODR.

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Until recently. Every single one is getting denied and I have to contact seller support to escalate to the claims team. Anyone know what changed?