JMAP internal server error : #jmap mailbox does not exist

Hello,

Trying to get all e-mails from a given contact, I first fetch the 
contact e-mail addresses and then issue a JMAP-Email query like this:

       [
         ['Email/query', {
           accountId,
           filter: {
             operator: "OR",
             conditions: [
               {from: "[email protected]"},
               {to: "[email protected]"},
               {cc: "[email protected]"},
               {bcc: "[email protected]"}
             ]
           }
         }, '0'],
         ['Email/get', {
           accountId,
           '#ids': { resultOf: '0', name: 'Email/query', path: '/ids' }
         }, '1']
       ]

However, I receive an internal server error:

     {
       "methodResponses": [
         ["error",{"type":"serverFail","description":"Internal Error"},"0"],
         ["error",{"type":"resultReference"},"1"]
       ],
       "sessionState":"0"
     }

And the Cyrus logs are showing:


login: localhost [127.0.0.1] [email protected] Basic User logged in 
SESSIONID=<cyrus-1637702083-186327-2-17789273766385461114>
jmap_openmbox(example.org!user.mildred.#jmap): Mailbox does not exist
jmap: guidsearch_run: can't begin search for example.org!user.mildred
localhost [127.0.0.1] as "[email protected]" with "Mozilla/5.0 (X11; 
Fedora; Linux x86_64; rv:94.0) Gecko/20100101 Firefox/94.0" via 
SESSIONID=<cyrus-1637702083-186327-2-17789273766385461114>; "POST /jmap/ 
HTTP/1.1" (origin=http://localhost:5000; referer=http://localhost:5000/; 
auth=Basic; jmap=Email/query,Email/get) => "HTTP/1.1 200 OK" 
(allow-origin) [timing: cmd=0.038068 net=0.000019 total=0.038087]


Looking at the spool directory in 
/var/spool/cyrus/domain/example.org/user/mildred/ I don't see the #jmap 
mailbox, however I see #calendars #addressbooks #notifications and IMAP 
folders. Why is #jmap absent, and am I missing something in the 
configuration to get this #jmap mailbox created?


I already accessed the account via a regular IMAP client. I'm playing 
for weeks with JMAP and it's the first time I see this errror... 
although it's true that I never uploaded a file via JMAP yet. (#jmap 
seems to be the |jmapuploadfolder| in imapd.conf default values)


The server configuration contains:


autocreate_quota: 0
autocreate_post: 1
autocreate_inbox_folders: Junk | Trash | Archive | Drafts | Sent
#autocreate_sieve_folders:
autocreate_sieve_script: /etc/cyrus/default.sieve
autocreate_subscribe_folders: Junk | Trash | Archive | Drafts | Sent
autocreate_subscribe_sharedfolders_all: 1
# https://tools.ietf.org/html/rfc6154
xlist-junk: Junk
xlist-trash: Trash
xlist-archive: Archive
xlist-drafts: Drafts
xlist-sent: Sent


What should I do to have #jmap (auto-)created when needed?


Thank you


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