Increasing the gap limit might make the address viewable in Electrum.
This would help only if OP is make same mistake as me and pick some change address which was possible with Ledger Chrome App. In that case coins are still in his wallet, but Ledger is not check that address because of gap limits.
RDH40, did you try to use Electrum and increase gap limit? To do that just connect your just follow these steps : https://support.ledger.com/hc/en-us/articles/115005161925-Set-up-and-use-Electrum
After that in Electrum console copy/paste :
This will create 100 change address, and if one of them is one you send coins, your balance will be upadated. You can change number of address to any number, and also change True to False to generate receiving addresses.
This may not help either, but in the absence of other solutions, it's worth trying.