Add PreFix to Outlook Message Subject via Graph API???

[myatix]

Hi All,

I am trying to add a prefix to an email and then move it to a new folder in the same mailbox. I do not want to forward to email as it is in the correct mailbox.

I can understand if I use MS Graph I can manipulate the message using the HTTP action to call the graph message api

https://graph.microsoft.com/v1.0/users/[UserID]/messages/[Message id]

I am not a developer and could use a little assistance in getting this to work. 

If I initiate a variable and concat the subejct of the orginal email then update this via graph I am hoping this will work.

concat('PreFix',triggerOutputs()?['body/subject']) 

Is my Expression correct?

{
   "subject":[
      "@{variables('MessageSubject')}"
   ]
}

[myatix]

The question is can this be done?

I am not even sure you can minipulate the subject line of an email in Graph?

https://docs.microsoft.com/en-us/graph/api/message-update?view=graph-rest-1.0&tabs=http

The subject of the message. Updatable only if isDraft = true.

Has anyone found a solution to changing the subject of incoming emails. The business case for this is we need to add a PreFix to incoming emails so they can be handled in our ticketing system.

[VictorIvanidze]

Hi @myatix,

you can add a prefix using an Exchange online transport rule. 

Are you sure you have to do that using Power Automate?

[myatix]

@VictorIvanidze  Thanks for the response! Yes we could use a transport rule but we are currently using Power Automate to move Invoices from a shared mailbox junk folder to the correct folder in the same mailbox so it would have been nice to have it all included in the same Power Automate flow.

But I can see this isn't possible... 

[VictorIvanidze]

MS documentation is wrong.

I've just done a quick test and in fact you can change the Subject of ingoing message.

Request body I've used is

{
    "subject": "blabla"
}

[myatix]

@VictorIvanidze 
Thanks for the response ... But

I get a 405 error stating:

{

  "error": {

    "code": "ErrorInvalidRequest",

    "message": "The OData request is not supported."

  }

}

How did you get yours to work?

[VictorIvanidze]

What action you are using to execute a request?

Try to use "Send an HTTP request" from "Office 365 Groups" connector.

[myatix]

@VictorIvanidze  I was using the standard HTTP action as shown in my first post.

I get the same issue with the Office 365 Group connector?

As well as the same error in the "Outlook - Send an HTTP Request" connector. 

[VictorIvanidze · Accepted solution]

This works for me:

Try to do the same. 

[myatix]

@VictorIvanidze Thanks for the help! The reason it wasn't working was that my Graph API call was miss formed. I read another community post which helped me solved the issue for a shared mailbox. 

https://powerusers.microsoft.com/t5/Using-Connectors/Item-Id-doesn-t-belong-to-the-current-mailbox/m...