I think you did the right thing. There are other options for BCH besides Coinomi, and transferring BTC after the fork doesn't affect BCH
and then ...
Did you use qrcode like the first poster recommended? Coinomi says you can type a private key, but copying and pasting the letters didn't work for me.
No, I hadn't even seen this thread before I did what I did! What I had read elsewhere was to transfer my BTC to Coinomi, then *uninstall* Electrum, and then as an added precaution to even delete the %APPDATA%\Electrum folder. (Of course, I still have a backup of my old Electrum wallet file, plus its BTC addresses and private keys.) So I didn't have Electrum any more to show its QR codes. Would snapping a QR code somehow present a different private key to Coinomi than copying and pasting it???
The advice of moving one's BTC to Coinomi *before* trying to "sweep wallet" into BCH from the old addresses -- based on the fear of some malware on one's PC (I'm anti-virused up!) or the fear that Coinomi itself might do something malicious -- seems so far to me to be ill-advised.
When Coinomi says "This private key does not contain any funds", it's telling the truth -- of course there are no funds in it, I had just moved them!
I should have swept the wallet for all my Electrum BTC addresses containing Bitcoin *first*, *then* moved my funds, and then uninstalled Electrum, whatever.
What's obvious from this thread is that Electrum as the BTC "source wallet" is not the only issue, there seem to be multiple "source wallet" problems. I'd venture that Coinomi being the only "destination wallet" problem is not exactly correct either...
There must be a way to get one's Bitcoin Cash from pre-fork Bitcoin addresses whose funds had been moved *after* the fork!
You did add a bch wallet too to coinomi, and swept your bch containing wallet from there, did you?
If you have an electrum seed you can put that in electron, and claim your bch.
In Electrum, after moving your BTC to a save other wallet, go to wallet-private keys-export, save the key,
Now in electroncash: file-new/restore, to the right of the wallet name suggestion click "choose" and pick the key you saved from the Electrum wallet before.