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InvalidTemplate. The length of substring can't be longer than '___' which is the length of the source string.

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Posted on by NewBee

I inherited a flow triggered by adding an event to an Outlook calendar. The flow parses the email and creates a new ics file that we use elsewhere. In most cases, it works as intended. However, for a few events, it fails on "Get URL"

The only difference I can see is a switch that is triggered by the subject.

One that works looks like this:

One that fails looks like this:

Any ideas on how to get this to work consistently?

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Using flows

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Chriddle 8,686 Super User 2026 Season 1 on at

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substing expects parameters text, startIndex and length (not endIndex)

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NewBee 3 on at

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When I took a closer look at the flow, I noticed that the "Get URL End Index" was not showing up in my dynamic content. Is that what you were hinting at?

What has me stymied is the flow works 90% of the time.
It cancels the flow when an incoming message doesn't meet the conditions set.
It triggers correctly for 13 of 15 meeting notice types.
But for some reason, there are 2 instances where it gives an error message on "Get URL". When I look at "Get URL End Index", it gives a negative number on the failed flows.
On the successful flows, it gives a positive number.

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Chriddle 8,686 Super User 2026 Season 1 on at

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Seems that you end index string ('If you need') does not exist.

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