Still not recieved my black dog skin

@roemerl Fair dinkum. Are you talking about the pre-order bonus?

I can't see how after five months they could have possibly failed to send you the code.
You do realize it was a code sent to your account on the Xbox app.
Check your activity alerts.
Also make sure that you are logged in to the same account used when you purchased the game.

Send a report to Rare by following the below link.

https://support.seaofthieves.com/hc/en-gb/requests/new?flash_digest=9e5bca80c36e850587fda59c1bc3a94889174cff&flash_digest=e334ad422bc12a32130a5b585d03c61e3ee53cc1
Good luck