@Markin7 

Unfortunately, the email address associated with your TP-Link ID cannot be changed. This is because each TP-Link ID is permanently tied to a single email address. While you can modify other account information such as your name, password, and profile photo (by going to the left side menu > View Account in the Deco app), the email address itself cannot be updated.

Since you've deleted the original email address, you may need to create a new TP-Link ID with a different email address. If you have Deco devices, you can transfer ownership of your Deco network to the new TP-Link ID without resetting your system by using the "Change Owner Account" feature in the Deco app (tap the Deco map > three-dot icon at the upper top corner > "Change Owner Account").

To create a new TP-link ID follow the steps in the FAQ below. Follow the directions under the section "Create via Web Browser" 

https://www.tp-link.com/en/support/faq/1439/