An Invalid user parameter(s) error is thrown when adding a guest author that exists on the multisite network but the user isn't a member of the current subsite. Autosuggest doesn't display the existing user, but trying to add a user with an existing name throws an error.
An
Invalid user parameter(s)
error is thrown when adding a guest author that exists on the multisite network but the user isn't a member of the current subsite. Autosuggest doesn't display the existing user, but trying to add a user with an existing name throws an error.Steps to reproduce: