How do I re-activate my Snapchat account on my iPhone?

Contact Snapchat support. Apple cannot help you with that.

https://help.snapchat.com/hc/en-us

A_M_M9093 wrote:

I want reactive my account to Snapchat

You will need to contact Snapchat support.

Well neither can we, unfortunately. Best of luck, try contacting Snapchat support.

Zachyy wrote:

You will find a better solution there than here, click on the Snapchat support link I provided, and there should be an option "My Account is Compromised."

https://discussions.apple.com/content/attachment/0cfafb9b-5d7b-4d03-9c78-b59bcbbf245e

Or the I can't access my account, whichever suits your issue better.

You will find a better solution there than here, click on the Snapchat support link I provided, and there should be an option "My Account is Compromised."