Supported Okta email address characters:

Standard English Alphabet

Special Characters

! # $ % & ' * + - / = ? ^ _ ` . { | } ~
0, 1, 2, 3, 4, 5, 6, 7, 8, 9
- Except for the characters ' ` ~ shown above, no diacritical marks are supported in Okta email addresses
- The period character (.) may not be used to start or end the part of an email address that precedes the @ symbol (known as the "local"part), nor can two or more periods be used consecutively

Unicode Characters

Unicode characters are supported in user names. There is a known issue with supporting Unicode in primary or secondary emails
The following ranges of Unicode characters are not supported in workflows that involve integrations with Active Directory or LDAP, for example Delegated Authentication, all provisioning events, admin password reset, and import
- U+0000–U+001F (0-31)
- U+0080–U+009F (128-160)
If a Unicode character is in question, the following link may be used to check if it falls within the supported Unicode ranges https://www.obliquity.com/computer/html/unicode0000.html

Other Requirements or Restrictions

The email address must contain an @ symbol
Email top-level domains (the 'com' portion of the email address) must have a minimum length of 2 characters and a maximum length of 20 characters
4-byte UTF8 characters are not supported in user names or email addresses

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