Getting RANDOM 502 error, bad gateway. "The filename, directory name, or volume label syntax is incorrect..."

[Eri_V]

Hi, 

Sometimes the flow works, sometimes I get this error. Basically, the flow creates automatically 9 folders when a new item is added to a specific list. This morning we added two lines, one worked, the second failed. I'm trying to figure out what's going on, if there's a pattern regarding the syntax. We "realized" (or guess?) that when the line title ends with a point (.) flow fails. 

I read that this 502 error is a temporary error so I tried to resubmit it a couple of minutes/hours after, but didn't work. 

Any ideas? 

  "error": {

    "code": 502,

    "source": "canada-001.azure-apim.net",

    "clientRequestId": "67444b4d-b6c3-4532-87c2-50d5c9ae6bed",

    "message": "BadGateway",

    "innerError": {

      "status": 500,

      "message": "The filename, directory name, or volume label syntax is incorrect. (Exception from HRESULT: 0x8007007B)\r\nclientRequestId: 67444b4d-b6c3-4532-87c2-50d5c9ae6bed\r\nserviceRequestId: 67444b4d-b6c3-4532-87c2-50d5c9ae6bed"

[v-litu-msft]

Hi @Eri_V,

These characters are not allowed in the folder name of SharePoint:

~ " # % & * : < > ? / \ { | }.

For information, please refer to the document:

https://support.office.com/en-us/article/invalid-file-names-and-file-types-in-onedrive-and-sharepoin...

Best Regards,
Community Support Team _ Lin Tu
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

[Eri_V]

Thanks for your answer. There's still something weird. Please look at restrictions indicated in the link you've shared: 

Characters that aren't allowed in ... SharePoint Online * : < > ? / \ | 

1. There's no point (.) in the restrictions

2. A folder was created automatically by power automate with the name Enterprise A.B inc 

 however, automatic creation of the folder with name: Entreprise Blue Inc. failed 

 This makes me think that no name can be ended by a point (.) even if it is not indicated in the restrictions

3. Last flow failed had the name: LYNE (LA TABLE HABILLÉE)

  However, there's no symbol on the name. 

I guess that some restrictions are not indicated in the site 😞

[v-litu-msft · Accepted solution]

Hi @Eri_V,

Yes, I tested it yesterday, if the folder name is ended by ".", it will report invalid character in the folder name. But if the dot in the middle of the folder name, it will not report, it is weird.

And the Franch could name the folder if name it manually.

It is true that there are some hidden restrictions that have not been indicated. Hope to follow the specification when naming.

Best Regards,
Community Support Team _ Lin Tu
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

[AlessandroM]

same error here.

Reading the topic I find a "blank space" at the end of the string. If i remove it, it works again. Thanks

[jdoandlk]

This was my solution, thanks