Calling Power automate http trigger from external system.

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Posted on by Gdarmon Outlook

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Hi,

I am trying to understand how we can securely call a flow from an external system.

I can see there is a new option for the trigger:

"Any user in my tenant"

It can be use internally - calling this flow from other flow in the same tenant - this works.

but didn't find other way to secure to call the flow from Postman for example.

please advise,

Gill

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Nived_Nambiar 18,138 Super User 2026 Season 1 on at

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Hi @DarmonGill

Try using Anyone option

Thanks & Regards,
Nived N 🚀

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YouTube: Nived N's YouTube Channel

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Gdarmon Outlook 372 on at

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Hi,
Anyone is not secured.
Trying to find a more secured way to trigger a flow from external system.
Thanks,
Gill

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Nived_Nambiar 18,138 Super User 2026 Season 1 on at

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Hi @DarmonGill

I think this below thread may help to answer all your queries 🙂

https://powerusers.microsoft.com/t5/General-Power-Automate/Security-for-HTTP-API-Trigger-of-the-Flow/td-p/1877062

Thanks & Regards,
Nived N 🚀

LinkedIn: Nived N's LinkedIn
YouTube: Nived N's YouTube Channel

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Manish Solanki 15,169 Moderator on at

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Hi @DarmonGill

Pls check out my blog that also covers method to call from postman:

How to secure HTTP request end point for external or 3rd party application? (technetty.com)

If this helps & solves your problem, please remember to give a 👍 and accept my solution as it will help others in the future.

Thanks

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Markus_Hanisch 2 on at

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@DarmonGill
Have a closer look at this YouTube tutorial showing among other how to call secured APIs by means of Postman.
OAuth Authentication for Power Automate HTTP Request Trigger

Especially pay attention to the scope. You will need to use two backslashes in order to get an access token.
https://service.flow.microsoft.com//.default
See also screenshot from the above mentioned YouTube tutorial:

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