I'm using Network-wide -> Alerts and attempting to add a test Webhook receiver. I'm using webhook.site as the receiver for testing purposes, so there's no authorization or shared secret or anything else. The payload template is the default Meraki template. On every network I've tested, "send test webhook" says simply "failed". There's no information that I can find about _what_ failed or how to fix it. Some of the networks do have a Webhook receiver configured already, and some do not. It doesn't matter which one I'm trying to add to. I only mention it as evidence that someone was able to add them successfully at some point, just not me.
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