# \#unique-identifier **URL:** https://community.auth0.com/tag/unique-identifier/542.md [Latest](https://community.auth0.com/latest.md) · [Categories](https://community.auth0.com/categories.md) · [Tags](https://community.auth0.com/tags.md) --- ## [Are user\_id unique across different auth0 accounts and tenetns](https://community.auth0.com/t/are-user-id-unique-across-different-auth0-accounts-and-tenetns/8022)
**Author:** [@admin27](https://community.auth0.com/u/admin27)\ **Replies:** 1\ **Last updated:** [August 30, 2017, 3:15pm UTC](https://community.auth0.com/t/are-user-id-unique-across-different-auth0-accounts-and-tenetns/8022 "2017-08-30T15:15:49Z")
For example if I have 2 different auth0 accounts with different tenants for 2 separate applications ( to separate user data) but they will be using a shared 3rd party service that assumes the user\_id are unique. Would th…