UNATTENDED Flow, Can't Post on MS Teams

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Posted on by CraigSparks37

131

Good day fellow Automatees.

I have an Unattended flow triggering my desktop flow and it runs perfectly.

BUT, I had to disable the Teams Posts in the desktop flow.

The moment I try enable the "|Post message in a chat or group" in the desktop flow,

I get the follow error:

Cloud connector call failed with status code 'BadRequest'.

StatusCode : 400

Message :

Body : {"error":{"code":400.0,"message":"Poster value is invalid."

IF I connect to the VM, where this flow is being run, and run the flowing from the desktop app, it works fine.

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Power Automate Desktop

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CraigSparks37 131 on at

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Apologies all,

I just realized the above post may appear very rude, as I forget to say:

Any advise / suggestions would be greatly appreciated.
thanks 🙂

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Deenuji_Loganathan_ 6,250 Super User 2025 Season 2 on at

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@CraigSparks37

Would you be able to share a screenshot of your flow if possible? This would help the community members understand your requirements and errors better, thereby increasing the chances of providing assistance for your case.

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CraigSparks37 131 on at

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Hi @Deenuji

The flow can be as simple as:
And it will fail with the above error. It is the Post itself that fails the flow, BUT only when ran Unattended.
My suspicion is that the MS Team initialization is not fully initialized by the time the post runs,
as unattended means that it is RDP'ing to my VM, and starting a new windows session..
But that is a suspicion.

Thanks

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Deenuji_Loganathan_ 6,250 Super User 2025 Season 2 on at

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@CraigSparks37
Are you tried the same in power automate cloud flow with same connection reference? Is that working fine?

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CraigSparks37 131 on at

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Hi @Deenuji ,
I have added a Teams post from the Cloud scheduled flow that is calling the unattended flow, and that works fine.
The problem is the desktop flow fails on posting to Teams.

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Deenuji_Loganathan_ 6,250 Super User 2025 Season 2 on at

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@CraigSparks37

I would recommend you to raise this issue with Microsoft team.

Thanks,
Deenuji Loganathan
🤖 Automation Evangelist
Deenuji - Follow me on LinkedIn

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