MS Team Configuration - Administrator username - Is Fusion account needed?

Summary:

While configuring the MS TEams integration we provide the teams administrator username in the field - "Administrator User name".

Question is - Do we need to have a Fusion account with same email address - as Teams Administrator user name?
In production if we configure this with Learn admin user account (configure the MS teams integration) and provide the administrator user name as of Teams.
But the emails are different, learn admin has their own email in user profile.

The teams administrator username is added to the field but no separate user account for ms teams account admin in Fusion.