BadRequest error in Update Item action

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Posted on by ZD-27040748-0

Hi All,

I have a flow, which transfers data from a MS Forms submission to a Sharepoint List. This flow contains a couple of actions to create a unique ID for each submission. The Update Item action fails from time-to-time. So far I figured that it is failing only if the form is submitted from a mobile device, but works every time when submitted from a PC...

Any thoughts on how to fix this issue please? If you need details, I can upload, just let me know.

Appreciate every support in advance!!

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Power Automate Desktop

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Vish WR 3,259 on at

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@ZD-27040748-0

What’s happening is that sometimes the data coming from mobile is slightly incomplete or not in the right format.

So when the flow tries to update SharePoint, one of the fields is either empty or not what SharePoint expects, and it fails with a BadRequest error.

To fix it, open a failed run and compare mobile vs desktop inputs. You’ll usually spot a missing or different value. Once all fields are properly filled before the update step, the flow should work consistently.

Vishnu WR

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ZD-27040748-0 10 on at

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Thanks Vish, I'm gonna try and find that missing data and will let you know.

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ZD-27040748-0 10 on at

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@Vish WR, thanks for your answer!
I've found the following difference between two runs.

"Transfer encoding" field is missing from the wrong one in the header section.

Checking the body section, is only two fields, status and message on the wrong one, but the good run contains a lot of data obviously...

Any thought?

Your support is much appreciated!!

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David_MA 14,614 Super User 2026 Season 1 on at

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If @Vish WR is correct that sometimes the mobile submissions are returning blank values, you can use the coalesce() function to handle this. This LinkedIn post has a simple explanation of this expression: (10) Power Automate Tip: Use coalesce() to Save Time, Money, and Headaches | LinkedIn.

If you do the comparison between mobile and PC submits and can find a unique issue with mobile responses, you should submit a ticket to Microsoft via your company's admin portal to make them aware of the issue. BTW, how are you determining that a respondent completed the form on a mobile device?

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ZD-27040748-0 10 on at

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Dear @David_MA,

Thank you so much for your suggestion! I am going to check the linked post, I hope I will be able to understand how to use this expression, as I am only an enthusiastic amateur in this topic :)

I was testing my flow and asked a couple of colleagues to test it as well, and we figured the flow is failing every time someone submits the form from a mobile device.

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