” (Although there are stories where people asked for promises from various contemporary Gedolim / Rebbes and were told if you want a promise, not just a Brocha, you can only find that by lubavitch. Don’t know if this is helpful because I don’t know by heart where to find it amongst the thousands of others, I just remember the story itself. But as it’s relevant I thought to mention.)”
no, not real helpful since I highly doubt it ever happened. Sorry.