When you invite a user to the back office it sends an invite email.
If you view the user in the back office and send the invite again it works fine.
If the invited user clicks the invite email - and then does not go any further (say they close the window to come back to it later) - it throws an error should you try to resend the invite:
{Email: ["A user with the email already exists"]}
I've replicated this on multiple 10.3.2 sites.
In my own case being urgent to solve via a custom backoffice plugin that allows invites I've had to make it delete and re-create the invited user.
Bug in backoffice user invites
When you invite a user to the back office it sends an invite email.
If you view the user in the back office and send the invite again it works fine.
If the invited user clicks the invite email - and then does not go any further (say they close the window to come back to it later) - it throws an error should you try to resend the invite:
{Email: ["A user with the email already exists"]}
I've replicated this on multiple 10.3.2 sites.
In my own case being urgent to solve via a custom backoffice plugin that allows invites I've had to make it delete and re-create the invited user.
I'm having the same issue in 10.5.0. Did you create an issue for Github?
I've created an issue here: https://github.com/umbraco/Umbraco-CMS/issues/14949
Note: a work-around is to delete and recreate the user, which you can do if they have never logged in but not after they've logged in.
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