Issue Summary

Workspace admins should be able to add individual domains in the Workspace membership restrictions, however, the UI doesn't allow you to complete the task.

Steps to Reproduce

1. Go to your Workspace settings
2. Select Workspace Membership Restrictions
3. select Allowed domains and addresses
4. Type a specific address such as user@user.com

Expected Results

The UI let's you add the user as restricted member.

Actual Results

When the button is clicked, we get

{"message":"invalid email address","error":"BAD_REQUEST_ERROR"}

Workaround

Currently, the only available workaround is adding the entire domain, or allowing anyone to be part of the Workspace.