Issue installing "Amazon MCF by ByteStand" - "Out of Stock" error message at checkout

Shopify Apps
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Topic summary

A merchant installed the “Amazon MCF by ByteStand” app to sync Shopify inventory with Amazon Multi-Channel Fulfillment stock. After installation, customers began sporadically encountering “Out of stock” error messages at checkout, even when items were actually available.

Current Status:

  • The app has been temporarily removed while seeking a solution
  • The merchant suspects a potential conflict between this app and another installed app
  • The issue is urgent and affecting customer purchases

Suggested Resolution:

  • Contact ByteStand support directly, as they have the most specific knowledge about their app’s functionality and known conflicts
  • App developers typically appreciate user feedback and can provide tailored troubleshooting

The discussion remains open with no confirmed solution yet.

Summarized with AI on October 26. AI used: claude-sonnet-4-5-20250929.
1

After installing “Amazon MCF by ByteStand” to synchronise our Shopify stock availability to our Amazon MCF stock, customers were sporadically receiving and “Out of stock” message at checkout (even when the items were in stock) - screenshot attached. Has anyone else faced this issue? We urgently need to find a resolution.

We know this isn’t a typical error and could be caused by some combination of functionality clash between this app and another. Any help would be greatly appreciated!

We have removed the app for now until we can find a solution.

2

Any time you’re having a problem with an app, I would reach out directly to the app. They will have the best information for your particular situation, and apps love to hear feedback from users.