It is necessary to use the customers's id in order to mention them in the portal

Summary

In order to mention a customer in the a request in the customer portal, it is necessary to use 'username'. But since the customer migration, the username is a global id, which causes it to be not user friendly when performing the action.

See the example:

With the customer migration, it should be possible to mention the customer using the e-mail address, which is not working in the moment.

Environment

Jira Cloud

Steps to Reproduce

1. In the request page (portal view), type 'e-mail address', and click on add. It won't have any result;
2. Now, try 'username' (the id). This is the only way to have it work currently.

Expected Results

It should be possible to mention the customer using e-mail address.

Actual Results

It is necessary to use the full id.

Workaround

Using the id will have the mention function work.