Now we can see that 'Continue with Microsoft' in the login page. Does it mean that we can login in using Microsoft credentials without have Atlassian Access subscription?
I believe this is correct.
This is just a convenient shortcut without the security features that come with Access i.e. no enforcement.
You may have to have the user created first in the system. There will be no sync e.g. for groups. You also have no control over who will actually be using Microsoft (and have controls enforced there e.g. 2FA) and who will be typing the same credentials (with a different password) into Atlassian form by hand.
The simple answer is 'yes'.
"Continue with Microsoft" is social login and it's optional. Users can choose this option or login normally using their email address and Atlassian account password.
With Access's SAML SSO, the users will be forced to use Azure AD credentials every time they try to login. It's not an option for the users.
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