My Snapchat is not working ss06 device band

You are most likely out of luck and your only chance is if SnapChat wants to allow you to use their service again. In most cases the ban is due to a violation of their Terms of Use and they are permanent. There is nothing Apple can do about it and every service has the right to allow you or not.

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

SnapChat has banned your iPhone because you have violated the Terms of Use with SnapChat

Only SnapChat can remove the ban on your iPhone. Apple is not involved with this at all.

Contact SnapChat Support for more details.

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

SSO6 ban means Snapchat has banned your device. This has nothing to do with Apple and no one other than Snapchat can help you. Typically however, SS06 bans are permanent.

Contact Snapchat for help.