Topic
Customer has reported that Rabbit MQ password stopped working and was prompting the message:

Not management user
Instructions
Cause:
Missing permissions/rights.
Solution:
In order to resolve the issue and grant the user with the required rights:
Run the following two commands in CMD from C:\Nintex\RabbitMQ\rabbitmq_server-3.8.1\sbin
.\rabbitmqctl.bat set_permissions -p / admin ".*" ".*" ".*"
.\rabbitmqctl.bat set_user_tags admin administrator