I assume, that you have a user resolver with a local user table in the same database (token database). This is my assumption, because you never told this. You actually always told very little.
Now let me tell you something about common. It is totally your assumption, that you think it is common, that users are located in the same database. No. This is not common, this is crappy design. Yes, you can do this with privacyIDEA, but as this is crappy design, why should this be done automatically.
From looking at several hundrets privacyIDEA installation let me tell you this: My educated guess is that 1% of the installation actually have a local userresolver on the same database. Why?
Because this is crappy design.
…but I am repeatring myself…