The advice is correct, you do need to log into your VM account and change the user name log in email from a VM email to a third party email such as gmail or outlook.
In order to set up the app password in email settings or to change it, it sometimes uses verification codes sent to the third party email used to log in.
As this new app password which is different to the VM account password for email client has been working for a good while now so email clients need the app password to connect to the server.. However if using webmail via the VM account the VM password works by logging in to the VM account and selecting email, so there are 2 distinct ways to view email. The forgot password is fotr the VM account password, the app password has to be reset in that account in account settings- email app password- generate or change.
This system is the same in most other email providers, where app passwords can be set up such as gmail.
