Today Connor and I found that a flow with the When an Item is deleted, was not being triggered. Why could this possibly happen?
Finding the Failed flow triggers
Table of Contents
In your flow run history you will find that there is a All runs link. The all runs link will give you a list of all the runs. However in my case there were no runs yet.

Clicking on the all runs got me to an overview where I can select the Failed checks view of the flow runs. This lists all the Failed run. It would really help if the Failed checks weren’t hidden away in the UI.

When an item is deleted trigger failing
When clicking on a failed flow run, the problem was clear. The When an item is deleted trigger is failing and the Only Site Collection Admins are allowed to use this trigger is returned by the trigger.

Only Site Collection Admins are allowed to use this trigger is a clear message. I gave my account site collection permissions and the flow started working.
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If only all error messages were this clear!
But at least the message was properly hidden away. Otherwise things would become to easy.