The request content was invalid and could not be deserialized using Array

[FedericoCoppola]

Hi,

I stated to use Array in this flow due to I need to attach different document (if they exists) to Approval Mail.

When I save all seem to be good, but now that I am running and testing the flow I get the following error:

The request failed. Error code: 'InvalidRequestContent'. Error Message: 'The request content was invalid and could not be deserialized: 'Could not find member 'ContentBytes' on object of type 'ApprovalsConnectorAttachment'. Path 'attachments[0].ContentBytes', line 1, position 689.'.'.

I have configured "Append to array variable" like this:

{
"Name": [DisplayName],
"ContentBytes": [Attachment Content]
}

How can I solve it?
It is really important for me.

Thanks
Federico

[ManishJain]

Hi @FedericoCoppola ,

In Apply to each use concurrent settings and use Compose action with JSON format you have used . Outside of apply to each use another compose and in expression use outputs(Compose) , not many of us know about this feature to get array . 

Thanks

[FedericoCoppola · Accepted solution]

Hi @ManishJain,

thanks for you reply!
I have solved using base64() function.

Best regards
Federico

[FedericoCoppola]

Hi @ManishJain ,

can you explain it better?
I did not understood very well, sorry!

Federico

[ManishJain]

Hi @FedericoCoppola ,

In Order to form an array without using set variable action you can use compose action and do the same thing in compose action which you were doing in set variable inside loop. Outside loop you can do another compose action and use in expressions outputs(Compose) . This compose variable is from the loop. It will give you output as array.

Thanks

[jaina]

hi @FedericoCoppola  can you share the final workflow how it looks like? thanks

[yaheardj]

How did you solve this? base64? Can you show a screenshot? 

[Anonymous]

{
"content": {
"$content-type": "@{body('Get_attachment_content')['$content-type']}",
"$content": "@{body('Get_attachment_content')['$content']}"
},
"Name": "@{items('Build_Attachment_array')?['DisplayName']}"
}

[Anonymous]

[blueplanet]

I found this helpful:
Solved: Re: Flow attachment Error - Power Platform Community (microsoft.com)

It doesn't use Compose - you can convert the attachment content into Base64 within the Append to array function.

{
"name":DisplayName,
"content": base64(body('Get_attachment_content'))
}

[kpromma]

this helped!  thank you!!

[WXu43]

Thanks a lot, it's been solved.

[AwadeshGupta]

Worked for me

[Anonymous]

can you elaborate more your solution, what is the new JSON code you used?

[GoodPanos]

The following worked for me. In my case I was passing attachments to the Approval action from the "When a new email arrives" trigger. Interestingly, the "When a new email arrives" trigger has an Attachments property that contains all the attachments but it would error out when passed to the Approval action. Similar error as reported here.

{
"content": {
"$content-type": "@{body('Get_attachment_content')['$content-type']}",
"$content": "@{body('Get_attachment_content')['$content']}"
},
"Name": "@{items('Build_Attachment_array')?['DisplayName']}"
}

[Ella1]

Where did you add the base64 at? On the apply to each or on the approval. Getting same error 

[ice1234]

Hi everyone,

I have the same problem. My flow has been working for a whole year then all of a sudden it started to fail two days ago. Getting this error: The request failed. Error code: '502'. Error Message: 'BadGateway'. The append to array was set up like this with sharepoint as my datasource: 

{
"name": @{items('Apply_to_each')?['DisplayName']},
"content": @{body('Get_attachment_content')}
}

Does anyone know what could be causing this?

[ManishJain]

Hi @ice1234 ,

Error 502 is temporary error , it should go away , please run your flow again.

Thanks

[FrancoJBO]

Hello, Can you share the final workflow how it looks like? thanks

[GoodPanos]

I responded to this thread with what worked for me and that's true when getting the attachments from Outlook. Also, I have discovered the following works for me universally with all attachment actions.

{
  "name": @{items('CompileAttachments')?['DisplayName']},
  "content": @{body('GetContent')}
}

However, I have this Flow with an approval action and no matter what variation of the attachments array I use, I still get the error of this post. I don't know what else to do.

Any advice is greatly appreciated.