Why can't I combine two discount codes for Black Friday?

Payments + Shipping & Fulfilment
1

I have two discount codes I want to have active for Black Friday.
One is a buy 2 get one free, CODE : BFSAVENOW

The other is, if you spend $150+ you get a free Terry Tote, CODE : TERRYTOTE

The codes work separately but do not allow me to combine even though I selected that they can be combined.

Website:

2

Shopify’s discounts can’t always “stack” in every case.

If you have 2 product discounts that apply to the same item in the customer’s cart, then only the highest discount will apply.

I recommend reading this helpdesk article where they explain discount combination rules. There’s a table at the end that explains every scenario: https://help.shopify.com/en/manual/discounts/combining-discounts/discount-combinations

Happy to help if you have any more questions.