Pop mail suddenly stopped working

I have been using yahoo.de for ages and it always worked using POP mail setting. I recently updated my contact info on the 3 Yahoo accounts I have (2 yahoo.de and 1 yahoo.com) but afterwards 2 of the accounts (both yahoo.de) will not access account via POP and comes up with this message:
Sending of password for user ******@yahoo.de did not succeed. Mail server pop.mail.yahoo.com responded: (#MBR1240) Please verify your account by going to https://login.yahoo.com
The third account which is yahoo.com is not affected and still works with POP
(and all accounts can still be accessed as Webmail.)
I checked all the settings on the yahoo.de accounts and they are totally correct but they just will not work with POP any more.
very strange and just can not solve this!
there is an error code (#MBR1240) but no idea what it means.

''re :Sending of password for user ******@yahoo.de did not succeed. Mail server pop.mail.yahoo.com responded: (#MBR1240) Please verify your account by going to https://login.yahoo.com''
I presume you did this.
''re but for some reason the two Yahoo.de accounts just will not access POP mail ''
Can you check something and report back.
You have two Yahoo.de accounts, but how many Outgoing SMTP servers for Yahoo.de do you have?
Tools > Account Settings > Outgoing Server SMTP
You should have two, one for each yahoo.de mail account.
If you only have one then use the 'Add' button to create another.
Where the User Name and password for the mail account is also the same UserName and password used by it's selected SMTP server, even though all the actual server details will be the same.
You can use the 'Description' section to help you identify which is which as it is not used by server. You could type eg: Personal or Business or even the first part of the email address - the bit before the @.
then make sure each mail account is using the SMTP server with correct User name and password.
Tools > Account Settings
select mail account name
look bottom right for the Ougoing Server(SMTP), select from drop down box the correct one for that mail account.

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