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Posted on by PV-28101601-0

I want to create a flow that every time a new calendar event is created with at least one attendee a new page is created in onenote. It seemed pretty straightfoward but I am getting a trigger error on "When a new event is created (V3)". I even tried to make it really simple without the condition of more than zero attendees and it still gives me the same error.

There's a problem with this flow's trigger

Details It hasn't been triggered successfully in the last 28 days

Unable to process template language expressions for trigger 'When_a_new_event_is_created_(V3)' at line '1' and column '40153': 'The template language expression 'concat('Meeting-', triggerOutputs()?['body']['subject'])' cannot be evaluated because property 'subject' cannot be selected. Please see https://aka.ms/logicexpressions for usage details.'.

Start time

Oct 28, 09:07 AM (

54 seconds ago54 sec ago

)

Duration

98 ms

Error

Action 'When_a_new_event_is_created_(V3)' failed

Categories:

Business Process Flows

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PV-28101601-0 4 on at

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ScottShearer 25,228 Most Valuable Professional on at

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It sounds like you are using a trigger condition. If so, can you post a screen shot of your trigger condition along with the full expression?
PV-28101601-0 4 on at

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In the When an new event is created (V3) Parameters

In the Settings Tracking I added this

In the Create page in a section I only added this in the parameters
David_MA 11,489 Super User 2025 Season 1 on at

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Please show your flow and the action where you have the expression and how it is formatted in the action? Based on what you've provided, I don't see a problem with the expression and without seeing your flow I cannot tell you what is the issue.

With regard to the "There's a problem with this flow's trigger. Details It hasn't been triggered successfully in the last 28 days", message, that will go away once you figure out the cause of the expression error and you have a successful run.
Nived_Nambiar 17,705 Super User 2025 Season 1 on at

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Hi,

just want to check - did your trigger settings has this option enabled ?