Yahoo mail addresses on mint using chromium or firefox

[nevj (Neville Jackson)]

@callpaul.eu

i cannot answer why either browser cannot add second address. Or run two addresses.

There was a topic a while ago… I cant find it … something to do with authentication changes in mail servers.
I think you will find no new mail service can be added to any mailer without considering the new authentication method… cant remember its name?
Existing services are not affected.

Found it

Impending outlook changes

Hi all, a few days ago I received an e-mail from the outlook people informing me of the following: The protection and security of your data is Microsoft’s top priority. To keep your account protected, Microsoft will no longer support mail and calendar apps that only ask for your Microsoft account username and password when you sign in. To ensure greater security, you must use a mail and calendar app that supports Microsoft Modern Authentication. If you do nothing, your third-party emai…

its called Oauth2.

I think that may be your issue.

I am clueless on Oauth2… have not looked into it on my own setup yet… but I did notice that I was unable to setup the mailer in a new linux… and therefore I was unable to access itsFOSS from that distro, because itsFOSS login requires a mailer.
I can see why older users have difficulties… am nearly there myself.