I've checked everything to disable 2fa, but it appears that Azure Portal has removed it:
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Checking https://mysignins.microsoft.com/security-info
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I always see this when I log into Business Central:
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The following which you should follow to turn off multi-factor authentication:-
Go to Microsoft 365 admin center -> Users -> Active users -> Select the user -> Manage multifactor authentication -> Select the user -> Disable multi-factor authentication