Error flow Parameter 'To' cannot be null or empty

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Posted on by ash79

Hi,

I created a very simple flow, which sends an email to notify the user that a file has been uploaded to their personal folder.
The flow worked correctly for 8 months, then suddenly it started to go into error.
Analyzing the flow, I saw that it does not find the email to send the notice to.
This is the output part of the working flow:

"Editor#Claims": "i:0#.f|membership|wn00220367@wgs.wuerth.com",
"Person": {
"@odata.type": "#Microsoft.Azure.Connectors.SharePoint.SPListExpandedUser",
"Claims": "i:0#.f|membership|wn00180633@wgs.wuerth.com",
"DisplayName": "Saccon, Guido",
"Email": "g.saccon@mebelettroforniture.it",
"Picture": "https://witglobal.sharepoint.com/sites/MEBIntranet/_layouts/15/UserPhoto.aspx?Size=L&AccountName=g.saccon@mebelettroforniture.it",
"JobTitle": "Capoarea"

This is the part where it gives the error:

"Editor#Claims": "i:0#.f|membership|wn00197389@wgs.wuerth.com",
"MediaServiceImageTags": [],
"MediaServiceImageTags@odata.type": "#Collection(Microsoft.Azure.Connectors.SharePoint.SPListExpandedTaxonomy)",
"MediaServiceImageTags#WssId": [],
"MediaServiceImageTags#WssId@odata.type": "#Collection(Int64)",
"SharedWithUsers": [],
"SharedWithUsers@odata.type": "#Collection(Microsoft.Azure.Connectors.SharePoint.SPListExpandedUser)",
"SharedWithUsers#Claims": [],
"SharedWithUsers#Claims@odata.type": "#Collection(String)",
"Created": "2025-02-03T14:16:56Z",
"Author": {
"@odata.type": "#Microsoft.Azure.Connectors.SharePoint.SPListExpandedUser",
"Claims": "i:0#.f|membership|wn00197389@wgs.wuerth.com",
"DisplayName": "RABIN, ABDUS",
"Email": "r.abdus@mebelettroforniture.it",
"Picture": "https://witglobal.sharepoint.com/sites/MEBIntranet/_layouts/15/UserPhoto.aspx?Size=L&AccountName=r.abdus@mebelettroforniture.it",
"Department": "Bassano Del Grappa",
"JobTitle": "Uff. Marketing"

When it fails, the part of the data relating to the "Person" entry is missing.

What could this be due to?
Thank you.

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Using flows

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MS.Ragavendar 5,036 Super User 2025 Season 2 on at

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@ash79,

The eMail Id which you referring in the flow is the active user or Inactive user?

Also, can you please share the screenshot of the flow which you are facing issue.

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Expiscornovus 33,195 Most Valuable Professional on at

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Hi @ash79,

With personal folder you mean you the OneDrive for Business site?

Can you also share a screenshot of your current setup, this will help troubleshooting.

Happy to help out 😁

I share more #PowerAutomate and #SharePointOnline content on my Blog, Bluesky profile or Youtube Channel

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ash79 4 on at

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Hi,

here the image of the flow:

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MS.Ragavendar 5,036 Super User 2025 Season 2 on at

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@ash79,

In which action the flow is failing. from the error it showing To Parameter is empty.

In any of the assigned parameters with the user eMail value having blank or user which is assigned is not active? If yes that is the issue i believe

Please click Accept as solution if my post helped you solve your issue. This will help others find it more readily. It also closes the item

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ash79 4 on at

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Hi,

the flow fails in the "compose" command, because it does not find the recipient's email (as it was not detected by the previous step). the user is active.

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MS.Ragavendar 5,036 Super User 2025 Season 2 on at

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@ash79,

It looks like your Power Automate flow is failing because the "Person" field is missing in some cases. Since the user is active, here are some possible reasons and solutions:

The "Person" Field is Not Always Populated

If the "Person" field is optional in SharePoint, some items might not have a value assigned.

Solution: Use a condition (null check) before the "Compose" action to verify if "Person" exists before trying to extract the email.

Modify the Compose action to handle missing values safely:

Use an expression like:

if(empty(outputs('Get_item')?['Person']?['Email']), 'fallback_email@domain.com', outputs('Get_item')?['Person']?['Email'])

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