# Add an already registered user to my app

**URL:** <https://community.piwik.pro/t/add-an-already-registered-user-to-my-app/960>\
**Category:** Account\
**Created:** [September 6, 2022, 9:07am UTC](https://community.piwik.pro/t/add-an-already-registered-user-to-my-app/960 "2022-09-06T09:07:34Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![marco](https://avatars.discourse-cdn.com/v4/letter/m/a698b9/32.png) [@marco](https://community.piwik.pro/u/marco)\
**Post date:** [September 6, 2022, 9:07am UTC](https://community.piwik.pro/t/add-an-already-registered-user-to-my-app/960/1 "2022-09-06T09:07:34Z")

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Hello,

I’m trying the free version of Piwik and I’d like to add a user already registered in Piwik, in my app.  
From the users section I try to send an invitation, but it tells me it’s already registered, so where should I enter him?

Many thanks

Marco

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<div class="post-metadata">

**Author:** ![Admin](https://avatars.discourse-cdn.com/v4/letter/a/3ec8ea/32.png) [@Admin](https://community.piwik.pro/u/Admin)\
**Post date:** [September 6, 2022, 9:41am UTC](https://community.piwik.pro/t/add-an-already-registered-user-to-my-app/960/2 "2022-09-06T09:41:12Z")

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Can you see this user on the users list? If not, most likely the e-mail is already in use on some other instance. We’re currently working on adding the possibility to use same e-mail address across multiple instances. For now, the workaround would be to use alias, e.g. [yourname+instancename@example.org](mailto:yourname+instancename@example.org). Most mailing providers have such functionality.