After 27 March 2020, you’ll no longer be able to use AUSkey and Manage ABN Connections. Instead, you will need myGovID & Relationship Authorisation Manager (RAM).
You will need to use myGovID & RAM if you use the Business Portal for your business to lodge activity statements or access the Small Busness Superannuation Clearing House.
Here the ATO have detailed the steps to get you set up & ready for the change: https://www.ato.gov.au/Business/Bus/Set-up-your-new-access-to-the-Business-Portal/
Please contact us fif you need help