There may be several reasons why you didn't receive the SMS notification of WeChat Pay Change Pass:

You may not have turned on the SMS notification function of WeChat Pay Change Pass. You can turn on the SMS notification function in the setting page of WeChat Pay Change Pass.

The mobile phone may have network problems such as unstable signal, which makes the SMS notification unable to reach your mobile phone in time.

the bank processing speed of the bank card payee is slow, and it takes some time to get the account. You can log in to the online banking or mobile banking of the bank card for inquiry and confirmation.

if the above reasons are not the cause of the problem, I suggest you contact wechat customer service or bank customer service for consultation.