Bug with emails that have "." in them breaks username requirements

Many email providers ignore "." in the email so you can login to Google provider with email such as "John.Frank.Doe@gmail.com" and username will be created as John.Frank.Doe, this breaks the "business rules" setup where username should only have one "." which is normally validated on the UI when changing username. If you create a user with periods in their username, it breaks the profile page for such users.

Trace how Google sign-in creates usernames and how the profile page handles usernames containing multiple periods. Confirm the applicable username business rule and reproduce the profile failure; done means period-containing usernames no longer break the profile page or violate the stated requirement.

Written by the indexing model from the issue text.