Hello @Alon and welcome to the Community!
If you are an admin, go to the project settings of the Project (Jira Administration > Projects > [Your Project] Triple dot menu > Project Settings) and check the permission scheme. It's possible that you are not a part of the group or the project role associated with the "Browse Projects" permission.
This happens to me every now and then and this is what it usually has been.
Hope this helps!
If he is truly in a Free instance, then the Permission Scheme cannot be modified.
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@Alon can you confirm that you are on the free plan? Can you also provide a screenshot of the permission scheme your new project is using?
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Hi Alon - Welcome to the Atlassian Community!
The new project caused not to be able to work on your existing project?
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We had a working project that wasn't set up properly, but I could work on it just fine.
We created the new project and deleted the old one and now I'm not able to access the data of the new project, with the error "Failed to retrieve project data" showing.
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What type or project is the new one? Did you copy issues from the old one to the new one before you deleted it?
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