I'm still not able to zap.

I get this message every time:

I have refreshed the NWC credentials for zapping on amethyst.

I also can't seem to send any amount via lightning to another lightning address.

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Discussion

Proofs already spent?

Duplicate outputs?

Now it's more clear. When you try to send to a lightning address directly from the wallet, you should get transaction with error. Go to transaction detail and DM me the audit trail from the bottom of the screen.

I'll then see exact error that we can sort out. After nwc will resume to work as well.

I had same signatures error, and resolved it via Settings -> Backup and Recovery -> Remove Spent Cash. You may get a warning about no spent cash found, but in fact will be able to zap afterwards. Hope that works for you.