master user namespace error?

[Thomas Winterstein]

Hello,

I've set up a master user for migration purposes and doveadm auth tests 
succeed. If I test with telnet, the login as user also works and 
performs a user search on ldap but I get a namespace error:

> Debug: ldap(testuser,1.2.3.4,<0o/OTasGHdfNCB>): Finished userdb lookup
> Debug: master userdb out: USER#011911998977#011testuser#011uid=500#011gid=500#011nopassword=<hidden>#011proxy_maybe=yes#011master_user=admin#011auth_mech=PLAIN#011auth_token=b8c3dfdfcc9ac33cb1c2f1d755g8e04db58a7aa0#011auth_user=admin
>  imap-login: Login: user=<testuser>, method=PLAIN, rip=1.2.3.4, lip=5.6.7.8, mpid=22569, TLS, session=<0o/OTasGHdfNCB> > Error: Namespace '': Mail storage autodetection failed with home=(not 
set)
> Disconnected: Namespace '': Mail storage autodetection failed with home=(not set) in=0 out=417 deleted=0 expunged=0 trashed=0 hdr_count=0 hdr_bytes=0 body_count=0 body_bytes

Anything special to consider in a proxy setup?

thank you
Thomas