Here's my Jira experience. MS shop, have a programming department, but I'm not in programming and programming isn't our core product.

Need something that requires a Jira request. I use MS Edge because that's what IT recommends and it's not my computer. The only putative upside is that it knows who I'm logged in as. I click on the link for Jira, it asks me if I want to sign in with my account, which I assume is the MS one since it has the right email/user for it. It tells me that's the wrong one. Would I like to use my Atlassian account? Sure, let's use the same email. Whoops, you don't have an Atlassian account, but there's an MS account for your company. Do you want to use that, or something from the usual list of places that will log you in (Google, Facebook, MS)? Note that the MS option is only included in the list of third-party logins even though it knows my company has MS logins setup. So I click the MS option, and it may or may not ask for my password, because I'm already logged in via Edge, but it will certainly do my 2FA. And now I'm finally able to tell IT what is bothering me, and they wonder why people always seem frustrated.

So, now that I've gone through that once, I can save a single click by not choosing the Atlassian account option and go directly to signing in with a third party. I can only assume this is supposed to be the streamlined process.