Event trigger not running the pipeline might be due to event grid, need assistance on creation

Hi,

I created a trigger which supposed to run a pipeline once new file arrived.

It seems like my trigger has no issue and the problem is that I don't have an existing event grid for that trigger.

Now, I'm trying to create an event grid subscription but I'm receiving the error below.

I don't know if I'm using the correct Endpoint as I'm just formatting it to the existing event subscription in our Azure.

what I'm using to create the event subscription:

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