I just tried sending 42k, didn’t work; 21k, didn’t work, 21 sats did work. Maybe you have too much balance in your wallet and is refusing large zaps? Otherwise just post a 42k invoice 😉
I use Primal wallet and can usually receive big zaps
I will try Muun. lnbc420u1pns8amnpp53dusd3q4wfh9c82j5anakrm8860q47w8ckz6da0l44w52y0qc7mqdqqcqzzgxqyz5vqrzjqwnvuc0u4txn35cafc7w94gxvq5p3cu9dd95f7hlrh0fvs46wpvhdcyctn2t5rzumqqqqqryqqqqthqqpysp5p4gu9kpmpxvjhep25tu7c7s08peajkj68yj0d8xld6xll4nw4yes9qrsgqh49dn5ffunwjavwvp2l6dhl527vvttqlw8t3jdrjp0tjgvxqccz8dymjzjc0cy6v848k3kzdgt2wmpg520cyjen726u2lvz0xt0xp6sqhf0mtl
Let me know if it doesn’t work