Hmm.  Well that at least explains why your "sweep wallet" at least appeared to work in your case -- your Electrum wallet had the BTC funds in it.  Mine didn't even *appear* to work, because I had read to move my BTC funds to a "safe wallet" *first* (Coinomi in my case).  So the BCH sweep (naturally) complained when I put in the private keys of my old BTC addresses that had had the funds in Electrum a few minutes earlier but now no longer did.

So you have a completely different issue -- you did the BCH sweep wallet using your still visible and current BTC pre-fork addresses, it appeared to work, and yet you can't see any BCH in your Coinomi wallet.  Right?

I might suggest opening a support ticket with Coinomi on your issue, but then again, the ticket I opened with them on my problem has as of now been being processed for 3 days and 22 hours -- with no comment, reply, no nothing.

I'm guessing they're dealing with a tsunami of support tickets from a) people who had moved their BTC funds to a "safe wallet" before attempting to sweep them into BCH (like me and several others I've seen in this thread), and b) people who who still had their BTC funds in their Electrum (or other) wallet), the sweeping appears to work, yet no BCH is visible in the BCH wallet (like yourself)...