Unfortunately, Uphold will only let you sell your SGB tokens, send them to someone who has an uphold account, of send to your bank account. Cardano use to be this way on Uphold.
I believe SGB falls under tier 4 wallets described on Uphold website. Notice Tier 4 wallets can’t withdraw to other wallets.
Uphold wallet tiers - https://uphold.com/en/transparency
You used these Wietse instructions - same as me. I have the account on MEW, but no SGB in there yet. Should there be?
I also have the same "issue" with Ledger as I found when trying to carry out the following instructions to connect my Ledger to Metamask for SGB. I add an ETH account in Ledger and it has a different address to the MEW one. So in Metmaks it always shows 0 SGB as the address isn't correct.
Someone in another thread suggested getting private key from MEW (you can get that if you have access to the app/account) and importing into Metamask. I'm a bit worried to do that as I'm not a fan of Meta :)