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Please click on "Accept invitation" and login to your organisation's Microsoft account if necessary. You may also need to accept will then see the following screen:
Click "Accept"
You will then see the following:
Click "Next"
Now you can set up MFA in the same way as described in the MFA user guide.
Updated login procedure
After you have accepted the invite and have successfully setup MFA, you are now able to login. The following is different compared to logging in using the normal method: