NO Client tried to access nonexistent namespace. (Mailbox name should probably be prefixed with: INBOX.)

Hi,
I'm trying create a folder under Inbox, using Jakarta Mail 2.0.0 , this is debug output :
A2 CREATE "Created folder - 2021-03-23"
A2 NO Client tried to access nonexistent namespace. (Mailbox name should probably be prefixed with: INBOX.) (0.001 + 0.000 secs).

Please advise how I can set a prefix ?

Thanks

Start by reproducing the CREATE request from the issue with Jakarta Mail 2.0.0 and review how mailbox namespaces and prefixes are configured. Determine whether a prefix setting resolves the request or whether the reported behavior requires a code or specification change.

Written by the indexing model from the issue text.