Unable to login to my Hotmails Account

This is because Microsoft have recently changed their security requirements. To fix this, remove the hotmail accounts from your Mac (under Settings > Internet Accounts (or just Accounts)), and then add them back choosing either Outlook or Microsoft Exchange for the account type. Either of these will comply with the updated security requirements from Microsoft.

Is the issue specifically a password one? Does it say that? It helps to include the exact message.

I really think, though, that this is a Microsoft issue. For several years now it has been on and off with us getting access to Hotmail on Macs using Mail. Nothing has changed on our end, it's just that one day it might work and another it won't. We don't have any issues on iPhones. It also isn't necessarily a password issue. Usually it is simply a "cannot connect" issue which implies it's a server issue. Again, the iPhones still work and everything else in our house works so it isn't our router.

In our case we are running two different macOS versions on our computers. I rarely use my computer to read Hotmail but when I do it works. My wife uses it everyday and she is the one with problems. It's a connection issue and once changing servers seemed to clear it up, but other times it does not help but the next day things are working again. Again all pointing in Microsoft's direction.

Realize that Microsoft has no reason to ensure compatibility between its servers and Apple's Mail app. If you contact them then I will bet they will just tell you to use Outlook. I also don't think this is a widespread compatibility issue with Sonoma Mail since I haven't seen anybody else complain.

Also, have you tried signing in with a web browser? I don't know that that will provide a solution to the Mail application problem but at least it will tell you it isn't your computer having a problem talking to Hotmail.

Download the Outlook app on the App Store and use that for Hotmail and Outlook accounts.

It is going to the same account, you're just using a different pathway. It's like two streets leading to the same place, but one street is now closed. You can still get to your house using the other street. Nothing has changed about your house.

You may not need to actually delete the old server, but it serves no purpose now. If anything, if you still see error messages because it is still trying to use that path too, then you need to delete it.

This isn't a solution for you, but your post does not surprise me at all. My wife uses Hotmail on her Mac and frequently there is some issue or other that eventually clears up on its own. I use Hotmail on my iPhone and I have never had a problem. She says when she has a problem on her Mac, her iPhone can still get access to the account. So basically I personally think it is Microsoft messing with something behind the scenes.

I know that there was mention of Outlook upping security requirements on applications getting access to their accounts. I haven't seen a flood of posts from users so maybe it was just on a specific level of accounts such as those provided by corporations and universities that contract email accounts through them? https://support.microsoft.com/en-us/office/modern-authentication-methods-now-needed-to-continue-syncing-outlook-email-in-non-microsoft-email-apps-c5d65390-9676-4763-b41f-d7986499a90d

Again, it is all going to the same place. There aren't two copies of anything. If I call you on your cellphone number and arrange a meeting, I don't need to call you on your landline to arrange the meeting too. The thing now is, one of your two pretend telephone services is disconnected and doesn't really serve any purpose. You can't call your email server that way anymore.

where should I sign out - under settings, not sure where to find this