It is a known issue with QBO right now.  Click gear>feedback.  write do a better job with error 9999 and then click ok and subscribe.  It is the top problem issue right now.

Resolution for 'been unable to connect issue: 'The last two days I have been unable to connect to my bank accounts to download the transactions daily – my bank is Nymeo' available: Yes.

The been unable to connect 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 been unable to connect issue yourself by looking for a resolution described in the article. If it is a complex been unable to connect issue or you are unable to solve the issue, you may contact us by clicking here or by using other been unable to connect support options.

For more information about resolving issues related to been unable to connect in Quickbooks/QBO or to get support for the issue 'The last two days I have been unable to connect to my bank accounts to download the transactions daily – my bank is Nymeo', click the link below: