When you create an OAuth 2.0 (3LO) app, it's private by default. This means that only you can install and use it. If you want to distribute your app to other users, you must enable sharing.
Please follow the instructions in the official guide to set up distribution.
Specify scopes
You need to specify the scopes that your app will use. For Jira, you will need to select the following scopes:
read:me
read:jira-work
write:jira-work
manage:jira-project
manage:jira-configuration
read:jira-user
report:personal-data
This is how the permissions should look like:
Specify scopes
Specify Callback URL
Specify callback URL
Overview
After you have created the app, you will see the overview of the app. Here you can find the client ID and client secret.
Settings with clientId and clientSecret
Overview of the new app
Set clientId, clientSecret into Appmixer Backoffice.
The last step is to configure clientId and clientSecret in the Appmixer Backoffice for appmixer:jira connector.