Occasionally, Amazon may prevent sellers from creating or completing FBA shipments. While this can be frustrating, shipment blocks are usually caused by inventory, product, or account-related restrictions that must be resolved before inventory can be sent to a fulfillment center.
Understanding the most common causes can help you identify and fix the issue more quickly.
📦 Storage Capacity Limits
One of the most common reasons Amazon blocks shipments is insufficient storage capacity.
Examples include:
Sortable storage limits reached
Non-sortable storage limits reached
Oversize storage limits reached
Shipment volume exceeds available capacity
Common error:
This product exceeds the allowed volume for SORTABLE storage.
In these cases, Amazon is preventing additional inventory from being sent until capacity becomes available.
⚠️ Missing Product Information
Amazon may block shipment creation if required product data is missing.
Examples:
Missing package weight
Missing dimensions
Incomplete product attributes
Invalid catalog information
You may see messages requesting you to submit dimensions or weight before continuing.
🏷️ Product Restrictions
Certain products cannot be sent to FBA due to restrictions such as:
Hazmat classification reviews
Compliance requirements
Brand restrictions
Category approval requirements
Dangerous goods evaluations
These restrictions are managed directly by Amazon.
🚚 Shipment Validation Errors
Amazon validates inventory before creating an inbound plan.
Common issues include:
Invalid prep requirements
Missing labels
Incorrect packaging information
Quantity mismatches
Shipment workflow validation failures
📊 Inventory Performance Issues
Poor inventory performance can reduce your available shipment capacity.
Contributing factors include:
Excess inventory
Aged inventory
Low sell-through rates
Storage utilization issues
These factors may limit how much inventory Amazon allows you to send.
🔄 Catalog or Amazon System Issues
Sometimes the issue is caused by Amazon itself.
Examples:
Catalog synchronization delays
Product contribution reviews
Temporary Seller Central issues
Amazon API validation errors
In these cases, waiting and retrying later may resolve the problem.
🔍 How to Identify the Cause
When Amazon blocks a shipment:
Review the exact error message.
Check your Storage Volume Monitor.
Review Inventory Performance metrics.
Verify product dimensions and weight.
Check for restricted or hazmat products.
Review shipment details in Seller Central.
The specific error message usually points to the root cause.
💡 Best Practices
To avoid shipment blocks:
Monitor storage capacity regularly
Maintain healthy inventory performance
Keep product dimensions accurate
Remove aged inventory
Resolve catalog issues promptly
Review Amazon notifications frequently
✅ Summary
Amazon may block FBA shipments due to storage capacity limits, missing product information, product restrictions, inventory performance issues, or temporary Amazon system validations. Identifying the specific error message is the fastest way to determine the underlying cause and resolve the issue.