No worries! It's still helpful information. One instance has no CSP, so it's not related to CSP—at least for you. Which wallet did you try? @BitByBit21 mentioned here that it works with the test Mutiny Wallet but not with NWC 0.4.2 on umbrelOS 0.5.4, for example.
I tested with Mutiny Wallet and it worked.
My original results were using NWC 0.4.2 on StartOS 0.3.5~1. I use this for zaps in Damus and its working.
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