Symptoms

In Acronis Cyber Backup, you are specifying or updating credentials for Microsoft Exchange.

You get this error:

| error 0x15d0046: The format of name 'admin' is not supported.
| function: AppBackup::ParseUserLogonName

or

Error code: 1905
Module: 349
LineInfo: 0x07861B1E784838A4
Fields: {"$file":"e:\\578\\enterprise\\applications\\common\\src\\diagnostics\\user_validator.cpp","$line":"137","$module":"rx_agent_fork_vsa64_14800","IsReturnCode":"1","$func":"`anonymous-namespace'::DomainUserValidator::Validate"}
Message: Account 'user' is not a domain account.

Cause

Specify domain.

Solution

Specify username as YOURDOMAIN\admin

For example:
Acroniscompany\administrator