Having the same issue.  Serial number for H9000R is coming up as invalid when I try to register online.   I sent an email to Eventide support several days ago.  I tried to call their main office but was informed support is working remotely and my best bet was to email.

I even posted this question on the Eventide Facebook page.

I re-sent my email request this morning.  Just looking to get my unit registered.  Thanks.