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MySQL error code

MySQL error 3926

MySQL server error 3926 is ER_CLIENT_PRIVILEGE_CHECKS_USER_DOES_NOT_EXIST, reported with SQLSTATE HY000.

PRIVILEGE_CHECKS_USER for replication channel '%s' was set to `%s`@`%s`, but this is not an existing user.
Error3926
NameER_CLIENT_PRIVILEGE_CHECKS_USER_DOES_NOT_EXIST
SQLSTATEHY000
GroupServer errors

Source: MySQL 8.4 Error Reference