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MySQL 8.4 Reference Manual  /  ...  /  Replication and User Name Length

19.5.1.38 Replication and User Name Length

The maximum length for user names in MySQL 8.4 is 32 characters. Replication of user names longer than 16 characters fails when the replica runs a version of MySQL previous to 5.7, because those versions support only shorter user names. This occurs only when replicating from a newer source to an older replica, which is not a recommended configuration.