When I try to export to Electrum the key I’m finding (following instructions in other threads) does not start with a 5, L, or K. When I paste the ‘key’ i do get into Electrum there’s a greyed our box stopping me from exporting. I have the correct password.
When you export the key, try this time to export it without protecting it with password
*This will make the result file contain one or more keys probably starting with K, then having a space and a date. The key without space and date can go into Electrum
*** Please keep in mind that this operation exposes your private key and if you have malware on your computer you'll lose your funds.
** Please make sure you download Electrum from electrum.org and you verify it before the first use (
https://bitcoinelectrum.com/how-to-verify-your-electrum-download/ )