Trouble When add new instances about awx-ha-instancegroup

[zsoterr]

Yes, I can confirm if the issue exists - I got same error after the deployment.
I couldn't fix that - until now-, but I found a "workaround" for this problem.

Here it is:
I had to use the older deployment: V9.1.1: and the new instances worked normally.
but,
I got error message on the webportal (for example: when I would have liked to add or delete project,): "Cal to api/v2/.... returned status 5000"
The error messages in the logs ( (web and task container) referred to rabbitmq:
"Connection to broker lost, trying to re-establish connection...
....amqp.exceptions.AccessRefused: (0, 0): (403) ACCESS_REFUSED - Login was refused using authentication mechanism AMQPLAIN."

The solution - for this problem-: I had to update the rabbitmq-server version from 3.5 to 3.6.
For example:
Add the rabbitmq repository (on all nodes):
cat << EOF | sudo tee /etc/yum.repos.d/rabbitmq.repo
[bintray-rabbitmq-server]
name=bintray-rabbitmq-rpm
baseurl=https://dl.bintray.com/rabbitmq/rpm/rabbitmq-server/v3.6.x/el/7/
gpgcheck=0
repo_gpgcheck=0
enabled=1
EOF

and run this commands:
yum check-update&&yum install -y rabbitmq-server-3.6.16
If you want , you can check the other versions: yum --showduplicates list rabbitmq-server

regards,
Robert