We have never used the FIRE system because our companies were below the threshold limit, however starting with last year most of our companies are now above the limit. The IRS chose that time to switch systems. Here is the answer to your response:

 You may use your existing (legacy) TCC to transmit or retrieve your Filing Information Returns Electronically (FIRE) System file status information for tax years 2021 and 2022, until November 26, 2023. Beginning January 2024, you will no longer be able to electronically file using your legacy TCC.

FIRE is no longer available for new accounts and EasyACCT still has not fixed the system.