Proflute applications now sign you in with Microsoft. Your password is no longer managed here.
Use your Proflute work account. To change your password, go to Microsoft My Sign-Ins. If you have forgotten it, use Microsoft password reset or contact your IT support.
You sign in with the account you accepted your invitation with - your own organisation's account or a personal Microsoft account. Its password is managed by your organisation or by Microsoft, not by Proflute: