Outlook "Needs Password" constantly

Question

My outlook is constantly asking for a password to sign in to the Microsoft account. I have outlook via a personnel 365 account but also use it to access my work emails.

I have tried the Logon network security fix but I do not have that option in my settings it is just greyed out.

When I click on the need password text in the bottom right of the screen it asks me to sign in on a Microsoft pop up. when I enter my work address it states: "This username may be incorrect. Make sure you typed it correctly. Otherwise, contact your admin." when I then change this to my personnel address it gives the following message: "You can't sign in here with a personal account. Use your work or school account instead."

Does anyone know what the issue is and a fix as it is driving me crazy having to close the dialogue box every 5 minutes.

As an additional note when I just close this dialogue box and then double click on the text "needs password" it connects and works fine for a few minutes until I need to go through the process again.