Generate Unique ID Based Multiple Cells - Excel

I am wanting to generate a unique ID in Excel based on 3 cells. Date, Name/initials & customer name in the format DDMMYYinitialsxx - Initials as 2 letters and xx is a number eg 01, 02.

If all 3 cells contain the same value then I want the ID to be the same. If the date and Name/Initials are the same but a different customer name then I'd like it to change the xx number at the end.

Ideally, the 'Name' column would be a drop down list just showing the first name with the initials linked to that name somewhere else in the sheet.

Example:

Thanks