I have a freelance plus license for Trados 2017.  I have it insalled and activated on 2 computers.  I recently bought a new computer and want to deactivate the license on one of my current computers, and re-use the license on my new computer.  But, when I try to deactivate using the online method, I get an error saying that there is a mismatch on a "lock file".   And, when I try to deactivate offline, I get an error saying that my certificate, which I copied from my SDL Trados account web page, is invalid.  I am certain that I copied and pasted the certificate properly, so this error is not my fault. 

I cannot deacctive the llicense on my old computer and so I am unable to use Trados on my new computer.  What is the solution?