Comcast account not working with Outlook 365

Since February my laptop stopped downloading incoming Comcast emails on Outlook 365, continuously asking me for the password. Yesterday I decided to delete the account and install it again, but it wouldn't let me. I know the password is correct, but it continues asking for it. This is really very inconvenient because I have folders on Outlook that I can open when I'm offline, and I can't do the same if I look at my mail on the web. Please help! I see that many people have the same issue.  I have allowed for third party under settings. I've done everything possible at no avail. It keeps asking me for my password, which I know is the correct one because it works fine on my cell phone and on the Xfinity web site. I was direct messaging with support and now they ask me to do a public post again.