Can’t send email from iPad or iPhone

Yes, I have gone on the Xfinity app and checked to make sure that the 3rd party enabler was on. I can send emails from the Xfinity app but not from my Mail app on my iPad or phone. I’ve tried deleting my account and adding it again but it didn’t work. I can receive emails on the mail app but when I try to send an email I get an error message that my username or password is wrong. I’ve checked them multiple times and they seem to be correct. 

Thank you for responding to my post. If you know of anything else I can try please let me know. 

@Katzablot,  If you could send our team a direct message with your full name, the name listed on the account (if different), and the service address associated with your account, I'd be more than happy to look into this for you. To send a Direct Message, please click on the chat icon in the top-right corner of the screen, next to the bell icon, and then type or select "Xfinity Support" to initiate a direct message.