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I did use my username as a memo, in the firs transaction. Not in the one where I sent/ burnt the CUB.

Yes, on the first step, I mean. It's not getting through for me, both on BSC and Polygon.

Weird. I got that error the first time but not the second ( with a higher fee ).

Thanks for letting me know. Will keep trying until it succeeds.😉 I tried sending the smallest amount without memo and it went through without issues, lol!