I am u able add HDFC account even same account added in bhim .the error is your UPI id couldn’tbe activated. I am using only one sim which is registered witb bank only broblem with tez app dont give relies like check your registerex mobile number update the app like that . If you provide the your mail id then I will share my screen shots. And please conform that are you able to solve this issue or not every day checking but still I got same issue . If you are able to solve then please give me the expected time. So many time I raise request to solve my issu but you people dont care about it.