Power Platform Community Forum Thread Details

Hi everyone,

I'm facing an issue with a Power Automate flow using the trigger When an event is modified from the Outlook connector.

My objective is:

- Run the flow only when an Outlook calendar event is updated (not when it’s created).
- If the same event is updated again later, the flow should detect it and run only once per update.
- Avoid duplicate or repeated flow runs from a single modification.

Currently, after I update an event, the flow is triggered multiple times (looping every 1 minute) — for example: 14:06, 14:07, 14:08, 14:09 — even though the event wasn’t modified again after the first time.

I'm using this condition in my flow to detect updates only:

json
{
"type": "If",
"expression": {
"or": [
{
"not": {
"equals": [
"@triggerOutputs()?['body/start']",
"@triggerOutputs()?['body/originalStart']"
]
}
},
{
"not": {
"equals": [
"@triggerOutputs()?['body/end']",
"@triggerOutputs()?['body/originalEnd']"
]
}
},
{
"not": {
"equals": [
"@formatDateTime(triggerOutputs()?['body/start'], 'yyyy-MM-dd')",
"@formatDateTime(triggerOutputs()?['body/originalStart'], 'yyyy-MM-dd')"
]
}
},
{
"not": {
"equals": [
"@triggerOutputs()?['body/subject']",
"@triggerOutputs()?['body/originalSubject']"
]
}
},
{
"not": {
"equals": [
"@triggerOutputs()?['body/body/content']",
"@triggerOutputs()?['body/originalBody/content']"
]
}
},
{
"not": {
"equals": [
"@triggerOutputs()?['body/location/displayName']",
"@triggerOutputs()?['body/originalLocation/displayName']"
]
}
}
]
},
"actions": {},
"else": {
"actions": {
"Terminar_1": {
"type": "Terminate",
"inputs": {
"runStatus": "Succeeded"
}
}
}
}
}

Despite these efforts, the flow is still executing multiple times per update.

Has anyone encountered a similar situation? Any advice on how to ensure only true unique modifications trigger the flow once?

Thanks a lot!

— Marcio

Categories:

Using flows

@CU28031222-0 It's always best practice to include trigger conditions when using automated flow triggers. This way, your flow will only trigger when it meets your criteria. Without trigger conditions, your flow will always trigger—then you need to run a condition check to see if the flow should continue.

You might be interested in these YT Tutorials:

♾️ ♾️ Fix Infinite Loops ♾️ ♾️ | 3 Ways to Avoid an Infinite Loop in Power Automate

In this Power Automate Tutorial I’m going to show you 3 ways to avoid an infinite loop. Keep in mind that there are more ways to avoid the infinite loop than what I’ll cover in this tutorial—choose the solution that works best for you.

IN THIS VIDEO:
✓ Understanding What Causes Infinite Loops
✓ Avoiding Infinite Loops with the Recurrence Trigger
✓ Filtering to Return Files Only in Power Automate
✓ How to Output a Total Count in Power Automate with the length() function
✓ Using Trigger Conditions to Prevent Flow Re-triggering
✓ Leveraging Service Accounts to Avoid Infinite Loops

----

4 Ways You Can Use Trigger Conditions in Your Microsoft Power Automate Flow

Trigger conditions can be set in most flow triggers. These conditions you set must be true for the trigger to fire.

In this Power Automate tutorial, I’m going to show you how to use trigger conditions in your flows to control when your Power Automate flows trigger. If your plan has flow run limits—you can avoid triggering your flows unnecessarily by using trigger conditions.

I’ll cover four different flow examples that would benefit from trigger conditions:

⚡️ Triggering a flow when a column is changed to a specific value
⚡️ Triggering a Flow When an Event Updated or Deleted
⚡️ Triggering a Flow When a New Folder is Created
⚡️ Triggering a Flow When a Specific Email is Received

I’ll also show you a trick on how to easily create the expressions needed and give you a few tips on how to troubleshoot your flow.

IN THIS VIDEO:

✓ Four different flows that would benefit from trigger conditions

✓ What is a trigger condition?

✓ How to add a trigger condition to your flow

✓ How to trigger a flow when a column is changed to a specific value

✓ How to trigger a flow when an event is updated or Deleted

✓ How to trigger a flow when a new folder is created

✓ How to trigger a flow when a specific email is received

✓ How to troubleshoot a trigger condition

✓ How to prevent case sensitivity issues with a trigger condition

✓ How to use the filter array action to easily compose an expression that can be used in a trigger condition

Hope this helps!

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