Hi, we use Atlassian Cloud with more than 200 users and we would like to have a JIRA Portfolio plugin for only 25 users. Would that be possible?
no, unfortunately that isn't possible. The amount of users have to match the tier of your host application.
More info about the pricing: https://de.atlassian.com/licensing/jira-portfolio#cloudlicenses-1
If you have further questions, just let us know.