Shopify Marketplace Connect Not Syncing? Fix It by Symptom

Find your symptom first

Shopify Marketplace Connect not syncing is rarely one bug. The app (formerly Codisto) runs several separate syncs: inventory out to the marketplace, orders in to Shopify, and listing content such as price, title and images. Each has its own setting and each fails for a different reason. Work out which one is broken before you change anything.

How Marketplace Connect sync works: two flows, four checkpoints

Two flows run in opposite directions, and most troubleshooting gets easier once you separate them.

• Inventory out. Shopify's available quantity passes through the listing's quantity rule and lands on the marketplace listing. This only happens for linked listings: Shopify's Help Center states that the app begins syncing orders and inventory after you link a marketplace listing to a Shopify product.
• Orders in. A marketplace order passes through your order import settings and becomes a Shopify order, with the marketplace name shown in the Channel field.

The part most guides miss is that the two flows depend on each other. Marketplace Connect support has described creating the equivalent Shopify order as the app's way of getting a marketplace sale into Shopify inventory. If that holds for your setup, turning order import off or filtering it means marketplace sales never reduce Shopify stock, and every other channel keeps selling units that are already gone. It looks like an inventory bug. It is an order import setting. Confirm it with one test order before relying on either assumption.

That gives you four checkpoints, in the order worth testing them:

1. Is the listing linked?
2. Does the listing's quantity rule follow Shopify stock?
3. Do the order import filters let this order through?
4. Is the marketplace's processing queue healthy?

Marketplace Connect not syncing inventory

Marketplace orders not syncing to Shopify

Missing orders are almost always a filter, not a failure. Marketplace Connect has four order import settings per marketplace account, and three of them can hide an order by design.

To check them, go to Apps > Marketplace Connect > Settings, click the marketplace under Accounts, review the Order import section and click Save. Repeat for every connected marketplace, because the settings are per account.

The fourth setting, tax handling, doesn't hide orders but does confuse reports. The default is Withhold tax, which imports the order without the tax the marketplace collected, so Shopify totals won't match marketplace totals.

For a single missing order, open Marketplace Connect > Orders, select Import in the Import column for that order, and click Save. Manual imports are unlimited and free. Automatic sync is free for the first 50 marketplace orders a month, and additional synced orders are billed according to Shopify's pricing page.

Price, title or images not updating on eBay

When you link existing eBay listings, the app asks you to choose a rule for five things: shipping rules, return policy, eBay title, description, and price and taxes. For each one you pick Use eBay settings or Marketplace Connect settings.

• Use eBay settings keeps the value that is already on eBay. Later edits to that field in Shopify will not flow to eBay. That is the rule doing its job, not a sync failure. For title, description and price you can switch it at any time in the bulk editor.
• Marketplace Connect settings overrides what is on eBay, and the original eBay settings can't be restored. Export or copy your eBay titles and descriptions before you choose it.

Two more settings change eBay content on purpose. A price adjustment (a constant, a percentage or an amount up or down, with optional rounding) makes the eBay price differ from the Shopify price. And if Catalog image sync is set to Off for a listing, images are managed on eBay and Shopify image changes are ignored. You'll find that column in Listings > Bulk edit > Columns > Other.

Rule out a platform-side backlog

Sometimes your settings are right and the queue is not. A Shopify Community thread opened on 13 August 2026 tracked exactly this for eBay:

• 17 August: Marketplace Connect support said the eBay API issue was fixed, but a large backlog meant images, listing updates and new listings would take time to publish.
• 24 August: support said image errors could continue until the backlog cleared, and gave no timeframe.
• 26 August: a merchant reported that eBay orders and fulfillment updates still reached Shopify, while stock sold on the Shopify store was not being reduced on eBay.

The last detail matters most. Sync failed in one direction only, so the app looked healthy while sold-out items stayed buyable. Whether that backlog is fully cleared on the day you read this is something to check, not assume.

Signs that you're looking at a platform problem and not a setting:

• Many listings went wrong at once, and you changed nothing.
• Errors appear on listings you haven't edited.
• One direction works and the other doesn't.

In that case, stop re-saving listings. Repeated edits won't move you up a queue, and they bury the evidence. Check the Shopify Status page, then open the support chat inside the app with a reproducible case: the Shopify SKU and variant, the marketplace item ID, both quantities, and the time you checked each one. A specific mismatch gets investigated. A general complaint gets a template reply.

If your catalog is too large to spot-check by hand, comparing Shopify available stock against marketplace quantity by SKU is a small scripting job, and it is the kind of marketplace integration work for Amazon, eBay and Walmart that Netalith takes on.

Connection problems: Etsy and store requirements

As of October 2026, Shopify's Help Center says new connections to Etsy can't be made with Marketplace Connect. Merchants already selling on Etsy through the app can keep using it. So if Etsy is your problem and the connection still exists, do not disconnect it as a troubleshooting step. You may not be able to reconnect.

The marketplaces you can connect are Amazon, eBay, Walmart (United States only) and Target Plus (United States only). The store itself also has to meet four requirements:

• An online store that is not in private (password-protected) mode.
• A valid payment provider activated in your Shopify admin.
• Shipping rates set up for the countries you sell to.
• A verified seller account, approved to sell, on each marketplace.

A store that was put back behind a password page for a redesign fails the first one.

Stop overselling while you fix it

Cancelled orders hurt your seller rating faster than a paused listing does. Until sync is confirmed working, control stock by hand on the marketplace side:

1. For every SKU that is sold out in Shopify, set the quantity to 0 or end the listing directly on the marketplace.
2. Keep a short exception list: SKU, marketplace item ID, Shopify available quantity, marketplace quantity.
3. Recheck that list each day. When sync resumes, expect the connector to overwrite your manual quantity with the Shopify number, which is what you want.

When a connector app is the wrong tool

Marketplace Connect fits a store that sells on its four supported marketplaces with standard listing rules. You have outgrown it when:

• You need a channel it doesn't cover, such as TikTok Shop, Temu, or Etsy as a new seller.
• You need your own alert when Shopify and marketplace stock diverge, not a discovery after the oversell.
• Your stock rules depend on warehouse, channel or product type in ways the built-in adjustments don't express.

At that point the answer is an integration built directly on the marketplace APIs, with sync logic and logs you control. That work is priced to scope. If you're not sure whether you need a fix, a different connector or a custom build, ask Netalith for a free quote and describe the symptom from the table at the top.