Disclaimer: Never share you mnemonic phrase with anyone.
I’m not familiar with the coinomi app, nor how they generated the private key used to form your Algorand address. The following documentation describes the protocol for generating an Algorand address based based on BIP39 (24 words + 1 checksum). Perhaps you can use your 24 words (lookup the corresponding bits) to calculate the 25th and recover your private key using the CLI Tools:
goal account import "your twenty five word mnemonic goes here ..."
That will store your key within kmd.