Expected behaviour
Authenticated user can fetch own _users object.
Current behavior with Couchdb 3.x
Authenticated user cannot fetch own _users object.
Possible solution
Change local.ini configuration
[couchdb] users_db_security_editable = true
Modifying the _security object [Permissions in Fauxton] of the _users database.
couchdb issue 2734
couchdb issue 2730