Oracle Error ORA-29399: user string does not have privilege to switch to consumer group string

Oracle Error Message

ORA-29399: user string does not have privilege to switch to consumer group string

Reason for the Error

An attempt was made to set the initial consumer group of the specified user but the user does not have the privilege to switch to that group.

Solution

Grant the privilege to switch to the consumer group to the user and then set the initial group.