Your store needs a Shopify plan that includes Flow: Basic, Shopify, Advanced, or Plus. Shopify Starter does not support Flow workflows.

The Shopify Flow app must be installed on your store. It is free from the Shopify App Store.

You need the Notify Me! Back in Stock feature in use — the triggers fire from real subscriber activity, so a store with no subscribers will not see anything fire yet.

The alert triggers fire once per subscriber, not once per channel. If a subscriber gets both an email and an SMS for the same restock, "first alert notification sent" fires once. Notification channel tells you which channel carried it first.

"Back in stock order created" fires once per restocked product. If a customer orders two products they were alerted about, it fires twice — once for each.

The plain version fires for every subscriber, signed in or not. It carries the shopper's email, phone and a Shopify customer id as plain text.

The (Identified customers) version fires only when the shopper was signed in to their customer account. Instead of a text id, it carries a real Shopify Customer reference.

Tag a product high demand when its subscriber count passes a threshold, using Subscriber count for variant on the alert trigger.

Tag a customer waited for restock when they order after an alert, so you can segment them later.

Post to Slack when a subscription comes in for a product you have discontinued.

Add signed-in subscribers to a customer segment, using the (Identified customers) trigger.

Workflows are not retroactive. Turn the workflow on before the activity you want to catch.

Reminder alerts do not fire the notification trigger — only the first alert for a subscriber does.

Subscriber count for variant is the count at the moment the alert was sent, not the count now.

Nothing in Notify Me! needs enabling for a trigger to work — the Connected badge is not a switch, and there is no per-trigger control to find. Turning a Flow workflow on or off is what starts and stops that event.

Turning a workflow off never affects your back-in-stock alerts themselves. Your subscribers keep getting notified exactly as before; only the automation stops.

I cannot find the Notify Me! triggers in Flow — check your Shopify plan first. Flow is not available on Shopify Starter, and the Notify Me! Shopify Flow page will tell you if that is the case. If you are on a supported plan, confirm the Shopify Flow app is installed.

My workflow never runs — open the workflow in Flow and check its run history. If there are no runs at all, the event has not happened yet since you turned it on: create a test subscription from your storefront on an out-of-stock product, and check again.

It ran once but the shopper got two messages — that is expected. A subscriber who gave both an email and a phone is alerted on both channels, but the trigger fires once for them. Notification channel names the channel that went first.

"Back in stock order created" ran twice for one order — the customer ordered two products they had been alerted about, and the trigger fires once per restocked product. If you only want one action per order, add a condition on the Order so the workflow acts once.

It runs twice for one signed-in shopper — you have both the plain and the (Identified customers) version of the same event switched on. Disable one, or add a condition.

The customer conditions are greyed out — you are on the plain version of the trigger, which carries a text id rather than a Customer reference. Switch the workflow to the (Identified customers) version.

An order did not fire "Back in stock order created" — we could not tie that order back to an alert we sent. Orders placed with contact details that differ from the ones the shopper subscribed with will not be matched.