Error: User bob@aaa.bbb doesn't have home dir set, disabling duplicate database

I made a mistake when I moved dovecot to a new server and only specified mail_location instead of mail_home

All I have in 10-mail.conf is

mail_location = maildir:/home/vmail/mailboxes/%d/%n

All emails for the few accounts I have are in these mailboxes and I can get/see them via my mail client

I do, however, get the following error

imap(bob@aaa.bbb): Error: User bob@aaa.bbb doesn't have home dir set, disabling duplicate database

After looking at https://wiki2.dovecot.org/VirtualUsers/Home I tried the following

mail_home = /home/vmail/mailboxes/%d/%n

mail_location = maildir:~/mail

Problem with this is that I now can't see any of my emails in the client.

Appreciate any help on how to fix this.

Thanks