I tried redeeming it on coinbin and signing it, but got error 400 when i broadcasted.
Did it show any kind of error message? It may just be a broadcasting or connectivity to remote server error, in which case you can use an explorer like blockcypher to try and rebroadcast the same transaction if the signing was successful and the issue was only when broadcasting it.
Can i send the redeem script and public key here so it can be easier for you to help? That wouldn't give away access to them, right?
There is no need to post it here if it looks like the following (the bold part should be the same and the rest should be of the same size which is 40 characters equal to HASH160 of your pubkey):
001479091972186c449eb1ded22b78e40d009bdf0089
I broadcasted it with multiple wallets, it's not working.
address
A6CqeniSjuEp2G5R1JfvPP5cMqEm2qQZiQ
redeem script
00142072920a93446cb9dcfb1ff27b477992f04b1990
public key
0329d0b509ffc7c65224bc2268f534f0e46dcf40815d021fe0caf698347434c85d
WIF Key:
QP****sY (52 characters total)
I followed the same process with a legacy address, works smoothly.
The issue is that it is attributing the WIF key to the legacy address and not the segwit address.
I can't find any other wallets that support segwit for doge either.