It's not connected to your Mycelium wallet. The twelve words that you have written down were the master seed aka private key from the Bitcoin ledger. That's why those twelve words are so important. If someone gets your twelve words then they can transfer your Bitcoin anywhere.

Just some questions.

Did you own Bitcoin BEFORE August 1st?

Mycelium Wallet will give you a code to accept incoming Bitcoin transfers, that isn't the private key.

Did you get the twelve words when you backed up your Mycelium wallet?