LDAP synchronized user is deleted after signing in with Azure AD

[LapNik]

When I use both the Azure AD and default login page authentication methods, my LDAP synchronized user gets deleted. I assume that this is because logging in with Azure AD changes the username from "firstname.lastname" to "[email protected]". The property teamcity.options.deleteUsers is enabled in my setup, so when the LDAP users are synchronized the latter username is not found and the user is deleted.

Preconditions:

• LDAP module enabled.
• Automatic deletion of users is enabled in LDAP configuration.
• At least one LDAP synchronized user exists in teamcity.
• teamcity.auth.formatDN=DOMAIN\\$login$

Steps to reproduce:

1. Log in with Azure AD.
2. Log out.
3. Log in with teamcity login page.

EXPECTED RESULTS:
Both login methods log in the same user.

ACTUAL RESULTS:
The original synchronized teamcity user is removed. New user is created if LDAP setting about creating new user on first login is enabled.