The Goods and Services Tax Network (GSTN) says as per Rule 10A, it is mandatory to furnish the bank account details within 45 days from the date of grant of registration or the date on which the return is required under section 39 is due to be furnished, whichever is earlier.
Kindly update your Bank Account details within 45 days. GSTIN Registration may be cancelled if such details are not updated within the timeline.
Source #GST Portal