Welcome to the Community!
We'll be glad to organize a call from our Accounts Team to assist you with your request. Although we're able to pull up an account using your community details, we're not sure if this is the same account you're trying to make the changes to. Can you send us a PM providing your username or customer ID and the TPG email address you'd like to switch to a POP3 account with. And since we're going to raise this for a call back, please include your best contact number and preferred time for a call as well.
For your reference: How do I private message (PM) in the community
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