If the landlord's application for Bank of Communications credit card is not approved, you can find out the reasons in the following ways:

① Call the credit card center for enquiry;

② Open the credit card official website, log in the account and check the reasons why the credit card application was rejected;

③ Go to the counter for consultation.

However, in general, the bank will say sorry, your application has not been passed, and it will not say that it has not been passed for any reason. The best I can tell you is that your comprehensive score is insufficient, that is, your credit and financial resources can't reach the application threshold, and so on.

Or the landlord's personal credit information system has a bad record, and the bank thinks it is risky to give you a card.

I hope my answer can help the landlord!