Years ago I used up my free digital ocean credits, wanted to start paying. They asked for more details which I provided, then asked for my facebook profile. A pretty unusual request, but I complied. They told me the names don't match up and just won't deal with me anymore. Literally gave me no obvious way to proceed. Felt pretty violating to give up personal info just to get brushed off.
Had it in the diminutive form. As in Deb instead of Deborah, pretty common in my home language.
Wish I could remember what the first step was, think it was pretty informal too, but can't be sure. Just remember feeling dumbfounded they wouldn't simply come back with another option.
Happily used AWS ever since.