There is quite a few NWC issues atm. Something about wallets supporting one NIP while most libs trending towards using a different NIP.

Imho, the wallets guard the money (for most nostr users), apps should consider supporting whatever the wallets use instead of vice versa.

Just looked at your account. Which provider did you use (or plan to use)? I couldn't find any past streams.

As for topping up. If you're having a problem with NWC just remove the connection from your settings. Then go to the dashboard and click on "select provider" on the bottom left. Chose a provider (see ping and cost/min). Once you've selected a provider you're taken back to the dashboard.

Next, click on "balance" on the bottom left. this opens a window showing current balance, top-ups and cost of previous streams. On the top-right there is a "Topup" button. If you click on that you can enter any amount and you'll receive a QR code and LN invoice you can copy.

I actually prefer this method myself over auto-topup with NWC. A working NWC connection is more important for zapping than occasional top-ups imo. Hope this helps, hit me up if you need more assistance. Btw, zap.stream also has a discord server. You'll find the link in the top-right menu of the website (click on your profile picture)