IOS 8 - MDM error while removing profile with provided identifier

I've implemented a custom solution for an MDM vendor, It works well but lately with an Iphone 6 device with IOS 8.1.3 installed, I got this error (MDM ErrorCode: 12013) while performing a "RemoveProfile" command. Here is command provided:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>

<plist version="1.0">

<dict>

<key>Command</key>

<dict>

<key>Identifier</key>

<string>com.nttdata.dymora.policy.restrictions.80EA49BF-9506-450E-8D99-6A9DA6ED 6999</string>

<key>RequestType</key>

<string>RemoveProfile</string>

</dict>

<key>CommandUUID</key>

<string>dd71d6d0-5e04-4baf-9408-841e01227bfb</string>

</dict>

</plist>

and here is device response:

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

<plist version="1.0">

<dict>

<key>CommandUUID</key>

<string>dd71d6d0-5e04-4baf-9408-841e01227bfb</string>

<key>ErrorChain</key>

<array>

<dict>

<key>ErrorCode</key>

<integer>12013</integer>

<key>ErrorDomain</key>

<string>MCMDMErrorDomain</string>

<key>LocalizedDescription</key>

<string>Il profilo “com.nttdata.dymora.policy.restrictions.80EA49BF-9506-450E-8D99-6A9DA6ED6999<E2 ><80>? non è gestito da MDM.</string>

<key>USEnglishDescription</key>

<string>The profile “com.nttdata.dymora.policy.restrictions.80EA49BF-9506-450E-8D99-6A9DA6ED6999<E2 ><80>? is not managed by MDM.</string>

</dict>

</array>

<key>Status</key>

<string>Error</string>

<key>UDID</key>

<string>bc880d07f41f5ef84a06253ee89a4bdd2b584b84</string>

</dict>

</plist>

I don't understand the reason why this command return such error, it has always worked properly!?!? Is there anyone with same error?

Thanks!

Paolo