As far as I know not yet.

Every time I try to use Muun I get an error message. Something about a LN Withdrawal and the invoice not being valid

No, I think because of not being a real lightning wallet , but an atomic swap one , it's not possible.

They would have to implement real lightning.

Don’t use Muum, it’s a fake LN wallet. It’s a onchain wallet doing submarine swaps. All your txs are read and monitored by their servers, since they are in control of the xpub.

The wallet design is so bad.

I've been using Muun to send, WOS to receive. Seems to work but haven't verified. Sats are going somewhere.

For zaps I think you need a LN address in your profile (not an LN invoice) and I don’t think Muun lets you create an address. I want to use Phoenix to receive zaps but have the same problem.