Saxon1066

leemac
I had the very same error, Celemony informed me that the number I was trying to register (The essentials registration number i recieved with Sonar Platinum) was the same number I had upgraded to Editor that I recieved with X3.
 
I assumed I'd be getting a different number and my idea was that Id have another licence for more installations. Celemony were very efficient at answering my emailed questions.
 
However, Cakewalk are not, a week later and still no reply from Cakewalk support, so don't hold your breath for a reply from them.
 
:(

leemac,
When I sent my serial number to Celemony, they said it was registered to another person and asked me to confirm that I am that person.  Is that what happened to you?  Why does Cakewalk have to be involved in your case?

I went to register my 'new' Melodyne Essentials that I thought I'd gotten with my upgrade to Sonar Platinum only to get an automated response from Celemony that it had already been registered. I contacted Celemony, who were highly efficient with responses and they confirmed that I'd already upgraded the number to Editor. After messages back and forth, they advised me to contact Cakewalk. I did by email on the 26th January, Im still awaiting a response other than the 'we've recieved your message' response.
 
Today I went to the Melodyne Fix page and entered in my serial numbers only to be told it was NOT a dupliacte!
 
I bit the bullet and decided to call Cakewalk support, only to find out they don't give telephone support until 1pm EST, Im in the UK. Clearly, you're knackered if you have a problem in the morning then :)
 
Im not sure what to do next.

Wow.  What a mess, leemac.  I know it's frustrating.  Let us know how it gets resolved.

I didn't get a different serial number for Melodyne Essentials with my Platinum upgrade from X3 Producer.  The serial number they gave me is the exactly same one they gave me when I bought the X3 Producer upgrade. 
 
I don't think you get an "extra" copy of Melodyne Essentials with an upgrade from X3 Producer to Platinum.  Even though it did appear in my account and wasn't there before, the serial number was the same.
 

msorrels
I didn't get a different serial number for Melodyne Essentials with my Platinum upgrade from X3 Producer.  The serial number they gave me is the exactly same one they gave me when I bought the X3 Producer upgrade. 
 
I don't think you get an "extra" copy of Melodyne Essentials with an upgrade from X3 Producer to Platinum.  Even though it did appear in my account and wasn't there before, the serial number was the same.
 

Same here.  However, since I also had X3, I could generate a new serial number at the Melodyne Fix page, and I could use Melodyne in Platinum.  It's weird, though.  I don't understand why we can't get a new Melodyne license with a Platinum upgrade.  I'm sure it's a contractual thing, but could be otherwise.

That's the is ue that has occurred. Instead of giving you a new serial number fro Melodyne they are reissuing a serial number previously allocated to you which then creates the error that the serial number is registered already.

Maybe it's come about as a consequence of Cakewalk merging the store and the forum. Some users had different emails for each account, and if you don't yet have a unified account that too can cause problems.

If you already have a Melodyne Essentials serial number from a prior purchase of SONAR X3 Producer, you should not receive a NEW Melodyne Essentials serial number from a purchase of SONAR Platinum. There are circumstances in which you may have been issued a new serial number due to the way your account was set up at the time of purchase (of either SONAR X3 Producer, SONAR Platinum, or both), but in the vast majority of cases, you should only have one Melodyne Essentials serial number in your SSO account. 

Joey Adams [Cakewalk]
If you already have a Melodyne Essentials serial number from a prior purchase of SONAR X3 Producer, you should not receive a NEW Melodyne Essentials serial number from a purchase of SONAR Platinum. There are circumstances in which you may have been issued a new serial number due to the way your account was set up at the time of purchase (of either SONAR X3 Producer, SONAR Platinum, or both), but in the vast majority of cases, you should only have one Melodyne Essentials serial number in your SSO account. 

Thank you for an answer at least on that one, it saves me chasing it and waiting for technical support to respond.
However, it does seem strange that I have multiple Dimension Pro & Rapture licences in my account from all my Sonar upgrades and it NOT apply to Melodyne Essentials.
 
Regards

having the same problem----sorry, but I did not understand the solution, but I seriously need to work. So yes, I only have one SN in my account, but when I go to use melodyne it asks me to register. When I try to register, it says it is in use.

michael japan
having the same problem----sorry, but I did not understand the solution, but I seriously need to work. So yes, I only have one SN in my account, but when I go to use melodyne it asks me to register. When I try to register, it says it is in use.

Hi. Log in to celemony.com with your account, remove old computer, and add new (IIRC).
Best of luck.

This serial number has already been assigned to your account. What does that mean? I go into Platinum to use it and there are just a bunch of grey blobs and then the prompt to register.