Mailbox move fails username” is not valid for UserPrincipalName. Valid values

Problem:

• mailbox move wizard fails with fallowing errors “Username” is not valid for UserPrincableName. Valid values are:

Warning:
“username” is not valid for UserPrincipalName. Valid values are: Strings that includes ‘@’, where ‘@’ cannot be the last character..

To solve the problem, fill in a domain name for troubled user and re start the mail box move……

MCITP (EMA), MCITP (SA)
MCSE 2003, M+, S+, MCDST
Security+, Project +, Server +

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