Unable to connect Power Automate actions to ArcGIS Enterprise 10.9.1.

[mniluka_CPB]

We are currently unable to connect our ArcGIS Enterprise portal (10.9.1) to Power Automate triggers. We keep receiving the following error message. I have tried reauthenticating multiple times using different apps, but we are still facing the same error.

Failed to retrieve dynamic outputs. As a result, this operation's outputs might not be visible in subsequent actions. Error details: The dynamic operation request to API 'arcgisenterprise' operation 'GetWebhookPayloadSchema' failed with status code 'BadRequest'. This may indicate invalid input parameters. Error response: { "message": "Fetching data from #######.com.au/portal failed. This is usually caused by an invalid authentication token that has expired. Please reauthenticate to continue. Error message: Error: unable to verify the first certificate fetch failedIf the error persists, please check ArcGIS Enterprise Client ID and App Secret provided", "success": false }

[abureaux]

I don't have an immediate solution for you. 

But I can at least confirm some stuff:

1. Did you follow these directions?
2. If so, did you take note of the steps for "ArcGIS Enterprise 11.2 or earlier"? E.g., Did you make and properly configure an App in your Enterprise and provide that App ID to Power Automate (i.e., "Client ID")?
3. Are you logging into the connection with an appropriate account (e.g., an Admin account)?

[AkshayHarshe]

@mniluka_CPB There might be multiple different issues here. Instead of trying to setup a trigger can you quickly try and see if you can retrieve data from your Enterprise using a Manual trigger and a `Get data from feature layer` Action? 

If that works they you may not have any issues with the connection and they might be with the webhook you are creating.  Firstly, Power Automate will need access to your feature layers so your Enterprise should be publicly available or available to Power Automate at minimum. See what ports you must have open to power Automate here: ArcGIS Enterprise ports. I don't know if they are still the same at 10.91

You can use this guide to troubleshoot webhooks if your problem is specific to triggers.:  Guide: Troubleshooting ArcGIS and ArcGIS Enterpris... - Esri Community