QB Issue Resolution:

have you opened the chart of accounts from the gear menu, and then clicked use register from the selection arrow on the bank account line?

If you are trying to get to it from the dashboard, intuit has a known problem with that widget

Resolution for Issue 'ANYONE KNOW WHERE BANK REGISTER WENT? IT SEEMS THEY WANT TO MAKE YOU TO CONNECT YOUR BANK ACCOUNT. CAN’T GET TO IT.' available: Yes (Solved).
Source: Intuit Community forum.

ANYONE KNOW WHERE BANK REGISTER WENT? IT SEEMS THEY WANT TO MAKE YOU TO CONNECT YOUR BANK ACCOUNT. CAN’T GET TO IT.: this 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 issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for Accounts
Quickbooks Repair Pro will resolve it efficiently and affordably. Guaranteed resolution of your issue, or you pay nothing!

Error Recovery for Accounts [Canada]
E-Tech is the #1 Quickbooks data migration and Conversion service provider.

Get 50% off Quickbooks Online

Click Here for 50% off!

Additional Support Options: