can you please confirm if you have any MFA policy being applied for all accounts? This issue normally happens when you have a conditional access policy that is applied for all the accounts, so, this account got automatically created and got the policy applied. If so, please exclude this account from that conditional policy and the issue should be solved.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…