Problems in pkg

I'm trying to use pkg to install/update packages, but I'm getting the
following error:

# pkg update
Updating FreeBSD repository catalogue...
Fetching meta.conf: 100%    163 B   0.2kB/s    00:01
Fetching packagesite.pkg: 100%    6 MiB   6.7MB/s    00:01
pkg: Unable to drop privileges: No error: 0
pkg: No signature found
Unable to update repository FreeBSD
Error updating repositories!


I tried to run the following command to try to adjust, but without success:

# pkg bootstrap -f

There is no file in /usr/local/etc/pkg/repos/FreeBSD.conf, follow pkg variables

# pkg -vv
Version : 1.17.2
PKG_DBDIR = "/var/db/pkg";
PKG_CACHEDIR = "/var/cache/pkg";
PORTSDIR = "/usr/ports";
INDEXDIR = "";
INDEXFILE = "INDEX-13";
HANDLE_RC_SCRIPTS = false;
DEFAULT_ALWAYS_YES = false;
ASSUME_ALWAYS_YES = false;
REPOS_DIR [
    "/etc/pkg/",
    "/usr/local/etc/pkg/repos/",
]
PLIST_KEYWORDS_DIR = "";
SYSLOG = true;
ABI = "FreeBSD:13:amd64";
ALTABI = "freebsd:13:x86:64";
DEVELOPER_MODE = false;
VULNXML_SITE = "http://vuxml.freebsd.org/freebsd/vuln.xml.xz";
FETCH_RETRY = 3;
PKG_PLUGINS_DIR = "/usr/local/lib/pkg/";
PKG_ENABLE_PLUGINS = true;
PLUGINS [
]
DEBUG_SCRIPTS = false;
PLUGINS_CONF_DIR = "/usr/local/etc/pkg/";
PERMISSIVE = false;
REPO_AUTOUPDATE = true;
NAMESERVER = "";
HTTP_USER_AGENT = "pkg/1.17.2";
EVENT_PIPE = "";
FETCH_TIMEOUT = 30;
UNSET_TIMESTAMP = false;
SSH_RESTRICT_DIR = "";
PKG_ENV {
}
PKG_SSH_ARGS = "";
DEBUG_LEVEL = 0;
BY THE WAY {
    all-depends = "query %dn-%dv";
    annotations = "info -A";
    build-depends = "info -qd";
    cinfo = "info -Cx";
    comment = "query -i \"%c\"";
    csearch = "search -Cx";
    desc = "query -i \"%e\"";
    download = "fetch";
    iinfo = "info -ix";
    isearch = "search -ix";
    prime-list = "query -e '%a = 0' '%n'";
    prime-origins = "query -e '%a = 0' '%o'";
    leaf = "query -e '%#r == 0' '%n-%v'";
    list = "info -ql";
    noauto = "query -e '%a == 0' '%n-%v'";
    options = "query -i \"%n - %Ok: %Ov\"";
    origin = "info -qo";
    provided-depends = "info -qb";
    rall-depends = "rquery %dn-%dv";
    raw = "info -R";
    rcomment = "rquery -i \"%c\"";
    rdesc = "rquery -i \"%e\"";
    required-depends = "info -qr";
    roptions = "rquery -i \"%n - %Ok: %Ov\"";
    shared-depends = "info -qB";
    mes = "info -f -k";
    size = "info -sq";
    unmaintained = "query -e '%m = \"ports@FreeBSD.org\"' '%o (%w)'";
    runmaintained = "rquery -e '%m = \"ports@FreeBSD.org\"' '%o (%w)'";
}
CUDF_SOLVER = "";
SAT_SOLVER = "";
RUN_SCRIPTS = true;
CASE_SENSITIVE_MATCH = false;
LOCK_WAIT = 1;
LOCK_RETRIES = 5;
SQLITE_PROFILE = false;
WORKERS_COUNT = 0;
READ_LOCK = false;
PLIST_ACCEPT_DIRECTORIES = false;
IP_VERSION = 0;
AUTOMERGE = true;
VERSION_SOURCE = "";
CONSERVATIVE_UPGRADE = true;
PKG_CREATE_VERBOSE = false;
AUTOCLEAN = false;
DOT_FILE = "";
REPOSITORIES {
}
VALID_URL_SCHEME [
    "pkg+http",
    "pkg+https",
    "https",
    "http",
    "filet",
    "ssh",
    "ftp",
    "ftps",
    "pkg+ssh",
    "pkg+ftp",
    "pkg+ftps",
]
ALLOW_BASE_SHLIBS = false;
WARN_SIZE_LIMIT = 1048576;
METALOG = "";
OSVERSION = 1300139;
IGNORE_OSVERSION = false;
BACKUP_LIBRARIES = false;
BACKUP_LIBRARY_PATH = "/usr/local/lib/compat/pkg";
PKG_TRIGGERS_DIR = "/usr/local/share/pkg/triggers";
PKG_TRIGGERS_ENABLE = true;
AUDIT_IGNORE_GLOB [
]
AUDIT_IGNORE_REGEX [
    "NULL",
]
COMPRESSION_LEVEL = -1;
ARCHIVE_SYMLINK = false;
REPO_ACCEPT_LEGACY_PKG = false;


Repositories:
  FreeBSD: {
    url : "pkg+http://pkg.FreeBSD.org/FreeBSD:13:amd64/quarterly",
    enabled : yes,
    priority : 0,
    mirror_type : "SRV",
    signature_type : "FINGERPRINTS",
    fingerprints : "/usr/share/keys/pkg"
  }


Does anyone happen to know any way to resolve this?
Thanks for any help.