SAC enabled and working well.
SAC administrator tried to login into SAC admin portal and after entering credentials. got following page:
Tenant license had expired.
Re-enable tenant in back end database.
Tenant license had expired a few days before account renewed. This gap in time meant that the account was disabled.
The disabled tenant is not deleted for a few months, so as long as the renewal is done within 3 months of the expired license, no data will be lost on the account.