This happened to me in Feb (for SPC).

Check these Partner Hub slides for a page saying "2FA for Sage ID" was due to be mandatory on March 19.

KB Article link.
------------------------------
Kevin Moyes
Technical Systems Analyst
Munjal White Consulting Co.
Toronto ON
------------------------------
Original Message:
Sent: 04-03-2024 09:50
From: Wayne Schulz
Subject: 2-Factor Authentication is coming
While this references Sage 50, I think 2FA/MFA is coming for SPC if it's not already there. The roadmap seems to say FY25 for Sage 100 and I think that's only the parts of Sage 100 that require some type of Sage account though I'd gladly stand corrected if anyone has better information.
------------------------------
Wayne Schulz
wayne@s-consult.com
Schulz Consulting
(860) 516-8990
Moodus, CT
------------------------------