The split amount is not showing up as separate transactions in the bank register as each belong to a different customer. What am I doing wrong?

Hi there, treasurer-sfjama.
 

For now, the option to show split transactions in bank register is unavailable in QuickBooks Online. However, I can provide you another way of this. As I've replicated, single payment deposit can apply for two customer. When creating this transaction, create a ban deposit with two lines and then match the bank deposit in downloaded transaction.

For future references, these resources will guide you on how to efficiently perform the following tasks in QuickBooks:

• Enter a split transaction into the register
• Categorize and match online bank transactions

I’m just a comment away if you have other banking concerns. Wishing you and your business continued success in all that you do.