--- Following your instructions ---
12 - Launched from Console: walletpassphrase "myPassPhrase" 60.
Got "Error: running with an unencrypted wallet, but walletpassphrase was called. (code -15)"
Even though I did encrypt the wallet while on V26 !
So, the OutletWallet is not encrypted and dumpwallet still does not work.
An I can confirm that OutletWallet is a descriptor wallet for the "Menu/File/Migrate Wallet" is grayed/not available.
What I've I done wrong ?
Is it possible that while you are on Version 26, perhaps your wallet is a legacy wallet ?
In this case it could explain why you can dumpprivkey while I cannot.
You are entering the passphrase for another wallet selected in the console.
When opening the console, you will see a menu with the option: wallet, you must select the corresponding wallet to give the command you want, in this case, enter the passphrase for the corresponding wallet.