How to give limited access on forms in Odk collect to specific user? Details are in the description

[mathieubossaert]

As far as I remember this is not possible with aggregate, which is no more maintained :

Aggregate is no longer being updated

In accordance with the plans announced at Upcoming changes to Aggregate, the core team is no longer updating Aggregate. We will not fix bugs, add features, review PRs, improve documentation, release new versions, or answer support questions. We've been communicating this reality to users over the last two years through the documentation, code repo, and in community announcements. The core team (and the @TAB) believe that Central is production ready and better than Aggregate for most users, so …

You should consider using ODK Central instead : users and forms management are one of its greats benefits !