What does User not found on Instagram mean?

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Tags

1. #instagrammer
2. #instagram
3. #permanently
4. #their
5. #person
6. #either
7. #owner
8. #means
9. #deactivated
10. #temporarily
11. #changed
12. #username
13. #profile
14. #disabled
15. #entirely
16. #deleted
17. #found
18. #account