not well-formed (invalid token): line 316, column 27 Failed deployment of client Efsf64_8Wk2!cv42 Warning: Execution of /opt/psa/admin/plib/api-cli/client.php --create Efsf64_8Wk2!cv42 -name John\ Doe -notify false -owner admin -passwd '' -passwd_type encrypted -creation-date 2015-02-23 -guid 2fb1bc58-a65a-4dac-8e14-89e50a89e166 -ignore-nonexistent-options failed with return code 1. Stderr is An error occurred during customer account creation: You can use alphanumeric, dash (-), dot (.), single quote ('), percent (%) and underscore (_) symbols in the user name. The user name should start with an alphanumeric symbol.
The issue was caused by incorrect symbols in clients usernames.
Change client's username on source server: Customers > customer_name > Change Login Info
For this case client name
Efsf64_8Wk2!cv42 should be changed: replace it with login name as per recommendation from the warning.