Welcome to Atlassian Community!
I saw that you are a member of three different Cloud sites, so I would like to confirm if you are using the app on the correct site because in one of them you are not an administrator.
Is cxxxxxxxk.atlassian.net the site that you can’t access projects?
Would you mind sharing with us a screenshot of the error?
Are you using iOS or Android?
Is it happening if you try to access another site?
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