Can't add Wise.com account to Vanguard

Another update. We opened a new Wise account for my wife, using her first and last name, no middle name, and vanguard still didn't allow it. So it's not an issue with middle names.

Don’t know what to say, maybe I just managed to do our wise bank changes in Vanguard early enough before their software started rejecting the bank details.

I think you're right. I wondered if there were other criteria for matching accounts. Vanguard asks for the name on the wise account, but it's possible they check address, email, or phone, all of which are different between vanguard and wise.