Cannot get comcast email on iphone but receiving emails on webmail

Need guidance in getting email on my iphone. I have set up according to the instructions but it appears that Comcast does not recoginize my user name or password despite being able to log in on my desktop with the same credentials. I switched cell phone providers and internet service a week ago and had no issues but now I cannot add the comcast email to the new phone. I believe my account is being locked on Comcast's end.