Good Day & Welcome to the Bell Community Forum.
Thank you for reaching out to the community and raising your concern.
I cannot speak for the apps that you are using and the reasoning why you are unable to set up your father's Bell email on an email client.
If you setup his email account on an email client, you will bypass MFA authentication for email access only. You do not need to specifically use your Sympatico email address. You can choose any email service provider.
You are not limited to exclusively using POP protocol. It is simpler and easier to use. You can also use IMAP protocol. It is more flexible, easier to set up and is best used across multiple devices.
If you wish to continue to use your Bell email address on an email client, I have included the instruction below:
Using Bell email : Bell email features
Here is a partial list of email clients that do work can be set up on a Windows 11 computer: Outlook, GMail, Thunderbird, eM Client, Mailspring, etc.
There is no work around for the MFA email authentication. All Bell customers are required to use multi-factor authentication (MFA). You cannot opt out.
Let us know if we can be of further assistance.
Take care.
I am a Community All-Star and customer. I'm here to help by sharing my knowledge and experience. My views on Bell and the Community Forum are my own and not the views of Bell or any of its affiliates.