ok this make much more sense, thank you for the clarification.
so if the txid is d3c999e3c258e6c9808bfcd73d5910bc9a037ebdf22277b0397f8e3ed1f2628c, where do I get the index value? It's necessary to complete the Replace-By-Fee transaction?
If I try without index I get the this error: [lncli] outpoint should be of the form txid:index

Ok, then! The transaction I'm playing with has only two outputs so, assuming the index will be equal to0 or 1, I tried the following:
lncli wallet bumpfee --sat_per_byte 4 d3c999e3c258e6c9808bfcd73d5910bc9a037ebdf22277b0397f8e3ed1f2628c:0
and get a new error: [lncli] rpc error: code = Unknown desc = the passed output does not belong to the wallet

Ok, first fail, let's try with index 1:
lnshell
and I get the below as output in the cli:
{ }
[lncli] rpc error: code = Unknown desc = invalid output index 2 for transaction with 2 outputs So now I don't know... did it went through? I check the mempool and look's it didn't

Ok, let's try with index equal 2
lnshell
[lncli] rpc error: code = Unknown desc = invalid output index 2 for transaction with 2 outputs
🤔
12 sats \ 1 reply \ @ChrisS 2 Aug
The empty brackets means you successfully tried the rbf(replace by fee). It doesn’t mean it’s confirmed or not but it’s now in the mempool with the higher fee.
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Nice, thanks for the clarification
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PS: in the meantime the transaction got confirmed, and I can see (one of) the RBF when through
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