Plus character is considered as a space in the login_hint

Knowledge Solutions
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Problem Statement

We are using the login_hint property to prefill the user’s email address on the new Unviersal Signup form. However, it seems that for email addresses that contain a + the + is replaced by Auth0 with a space when used as login_hint .

...&login_hint=test+1@example.com ===> test 1#example.com

Solution

You will need to encode the + (plus) character as %2B , e.g.:

…&login_hint=test%2B1@example.com ===> test+1@example.com