u/teridon

While the email address is remembered between full exit and start, it does not remember it if your login times out while using the supershell. When the login times out, you get a message that a timeout has occurred. When you then enter shell (!), you're prompted for your email address again.

PS C:\Users\teridon> keeper-commander.exe supershell --server GOV

[ US Gov banner trimmed ] 

Enter master password for teridon@someagency.gov
Password:

Exited to Keeper shell. Type 'supershell' or 'ss' to return.
Not logged in> login
Data center: GOV
Use login --server <region> to change (US, EU, AU, CA, JP, GOV)

Email:    ### <--- have to re-enter email address