Once a Pio user account is deleted, the email address used for that account cannot be added again to Pio. For security and data integrity reasons, email addresses from deleted users remain reserved. This applies even if the user was removed by an admin and you want to give access to the same person again.
How to add the user
It is still possible to create a new user in Pio Admin, but with a modified email address. Try, for example, by adding a suffix:
Most email providers deliver all of these emails to the same inbox, even though Pio treats them as separate accounts.
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Add new users
Resend user verification link for a new user
Access to multiple Pio apps