I just wanted to report that when using 1Password on the web to manage one's account, it is not possible delete a Vault when the Vault name has special characters. I had a vault with an apostrophe and despite me typing in the name of the vault correctly, the 'Permanently Delete Vault' button was still grayed out. When I changed the name of the vault to remove the apostrophe, viola - I was able to delete it.
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