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Yesterday a user told me they couldn't log in to my parliamentary monitoring site. On investigating, I found that Microsoft email security was logging in on behalf of my user by executing a POST. This broke the single-use sign-on link. Executing POSTs is usually considered unacceptable, and in this way Microsoft again transgresses an important norm. Here's how to deal with the specific POST problem & what might be done about these transgressions in general:
https://berthub.eu/articles/posts/shifting-cyber-norms-microsoft-post/