How do I fix the SS07 error and unban my Snapchat account?

You can't fix it. Apple can't fix it. We can't fix it. Apple has NOTHING to do with Snapchat. ONLY Snapchat can fix it. So you'll have to contact them directly for help. Here is a link to contact them --> https://help.snapchat.com/hc/en-us

Honestly, I have seen very few cases where SnapChat has removed a ban. It is their choice on who they want to allow use their service and there is nothing Apple can do about that. I have also seen where a different device will be banned if you attempt to login to your account on that device. SnapChat does not mess around when they choose to ban you.

Not sure why you are asking on an Apple site to unban your SnapChat account, it was not Apple that banned you.

From the Snapchat site:

”If you're seeing an SS07 error code when trying to log in, this means your device has been banned from logging into Snapchat because too many accounts have been associated with the device.

If your device has been banned, Snapchat Support cannot unban it for you.”

https://help.snapchat.com/hc/en-us/articles/7012325477268-I-get-an-error-message-logging-in-to-Snapchat

On Snapchat’s own site, it says that if your device is banned, Snapchat Support cannot (read: is not allowed by Snapchat management) to unban it.

If that is a permanent device ban, even contacting Snapchat may get you nowhere.

Servant of Cats wrote:

On Snapchat’s own site, it says that if your device is banned, Snapchat Support cannot (read: is not allowed by Snapchat management) to unban it.

If that is a permanent device ban, even contacting Snapchat may get you nowhere.

Except an SS06 ban is permanent and from seeing this question over and over and over, it appears an SS07 ban means they've detected unusual activity, such as logging in to too many accounts, suspicious activity and the like. From what I've read, after a period of time one can appeal an SS07 ban, whereas there is no appeal for an SS06 ban.