There is a bank link issue right now. Give them a day or two to fix it. You can try a manual update. Works for some, not for all.
Resolution for 'bank link issue issue: 'Received a new debit card. Since then nothing is synchronized' available: Yes.
The bank link issue issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the bank link issue issue yourself by looking for a resolution described in the article. If it is a complex bank link issue issue or you are unable to solve the issue, you may contact us by clicking here or by using other bank link issue support options.
For more information about resolving issues related to bank link issue in Quickbooks/QBO or to get support for the issue 'Received a new debit card. Since then nothing is synchronized', click the link below: