Can't add new user to project

[Kerblif]

I installed taiga using docker-compose. Everything works fine, but when adding a new person to the project, an error occurs:
/api/v1/memberships/bulk_create:

There is my docker-compose:

version: "3.5"

x-environment:
  # These environment variables will be used by taiga-back and taiga-async.
  # Database settings
  &default-back-environment
  POSTGRES_DB: "taiga"
  POSTGRES_USER: "${POSTGRES_USER}"
  POSTGRES_PASSWORD: "${POSTGRES_PASSWORD}"
  POSTGRES_HOST: "taiga-db"
  # Taiga settings
  TAIGA_SECRET_KEY: "${SECRET_KEY}"
  TAIGA_SITES_SCHEME: "${TAIGA_SCHEME}"
  TAIGA_SITES_DOMAIN: "${TAIGA_DOMAIN}"
  TAIGA_SUBPATH: "${SUBPATH}"
  # Email settings.
  EMAIL_BACKEND: "django.core.mail.backends.${EMAIL_BACKEND}.EmailBackend"
  DEFAULT_FROM_EMAIL: "${EMAIL_DEFAULT_FROM}"
  EMAIL_USE_TLS: "${EMAIL_USE_TLS}"
  EMAIL_USE_SSL: "${EMAIL_USE_SSL}"
  EMAIL_HOST: "${EMAIL_HOST}"
  EMAIL_PORT: "${EMAIL_PORT}"
  EMAIL_HOST_USER: "${EMAIL_HOST_USER}"
  EMAIL_HOST_PASSWORD: "${EMAIL_HOST_PASSWORD}"
  # Rabbitmq settings
  RABBITMQ_USER: "${RABBITMQ_USER}"
  RABBITMQ_PASS: "${RABBITMQ_PASS}"
  # Telemetry settings
  ENABLE_TELEMETRY: "${ENABLE_TELEMETRY}"
  # ...your customizations go here

x-volumes:
  # These volumens will be used by taiga-back and taiga-async.
  &default-back-volumes
  - taiga-static-data:/taiga-back/static
  - taiga-media-data:/taiga-back/media
  # - ./config.py:/taiga-back/settings/config.py

services:
  taiga-db:
    image: postgres:12.3
    environment:
      POSTGRES_DB: "taiga"
      POSTGRES_USER: "${POSTGRES_USER}"
      POSTGRES_PASSWORD: "${POSTGRES_PASSWORD}"
    healthcheck:
      test: [ "CMD-SHELL", "pg_isready -U ${POSTGRES_USER}" ]
      interval: 2s
      timeout: 15s
      retries: 5
      start_period: 3s
    volumes:
      - taiga-db-data:/var/lib/postgresql/data
    networks:
      - taiga

  taiga-back:
    image: taigaio/taiga-back:latest
    environment: *default-back-environment
    volumes: *default-back-volumes
    networks:
      - taiga
    depends_on:
      taiga-db:
        condition: service_healthy
      taiga-events-rabbitmq:
        condition: service_started
      taiga-async-rabbitmq:
        condition: service_started

  taiga-async:
    image: taigaio/taiga-back:latest
    entrypoint: [ "/taiga-back/docker/async_entrypoint.sh" ]
    environment: *default-back-environment
    volumes: *default-back-volumes
    networks:
      - taiga
    depends_on:
      taiga-db:
        condition: service_healthy
      taiga-events-rabbitmq:
        condition: service_started
      taiga-async-rabbitmq:
        condition: service_started

  taiga-async-rabbitmq:
    image: rabbitmq:3.8-management-alpine
    environment:
      RABBITMQ_ERLANG_COOKIE: "${RABBITMQ_ERLANG_COOKIE}"
      RABBITMQ_DEFAULT_USER: "${RABBITMQ_USER}"
      RABBITMQ_DEFAULT_PASS: "${RABBITMQ_PASS}"
      RABBITMQ_DEFAULT_VHOST: "${RABBITMQ_VHOST}"
    hostname: "taiga-async-rabbitmq"
    volumes:
      - taiga-async-rabbitmq-data:/var/lib/rabbitmq
    networks:
      - taiga

  taiga-front:
    image: taigaio/taiga-front:latest
    environment:
      TAIGA_URL: "${TAIGA_SCHEME}://${TAIGA_DOMAIN}"
      TAIGA_WEBSOCKETS_URL: "${WEBSOCKETS_SCHEME}://${TAIGA_DOMAIN}"
      TAIGA_SUBPATH: "${SUBPATH}"
    networks:
      - taiga
    # volumes:
    #   - ./conf.json:/usr/share/nginx/html/conf.json

  taiga-events:
    image: taigaio/taiga-events:latest
    environment:
      RABBITMQ_USER: "${RABBITMQ_USER}"
      RABBITMQ_PASS: "${RABBITMQ_PASS}"
      TAIGA_SECRET_KEY: "${SECRET_KEY}"
    networks:
      - taiga
    depends_on:
      taiga-events-rabbitmq:
        condition: service_started

  taiga-events-rabbitmq:
    image: rabbitmq:3.8-management-alpine
    environment:
      RABBITMQ_ERLANG_COOKIE: "${RABBITMQ_ERLANG_COOKIE}"
      RABBITMQ_DEFAULT_USER: "${RABBITMQ_USER}"
      RABBITMQ_DEFAULT_PASS: "${RABBITMQ_PASS}"
      RABBITMQ_DEFAULT_VHOST: "${RABBITMQ_VHOST}"
    hostname: "taiga-events-rabbitmq"
    volumes:
      - taiga-events-rabbitmq-data:/var/lib/rabbitmq
    networks:
      - taiga

  taiga-protected:
    image: taigaio/taiga-protected:latest
    environment:
      MAX_AGE: "${ATTACHMENTS_MAX_AGE}"
      SECRET_KEY: "${SECRET_KEY}"
    networks:
      - taiga

  taiga-gateway:
    image: nginx:1.19-alpine
    volumes:
      - ./taiga-gateway/taiga.conf:/etc/nginx/conf.d/default.conf
      - taiga-static-data:/taiga/static
      - taiga-media-data:/taiga/media
    networks:
      - taiga
    depends_on:
      - taiga-front
      - taiga-back
      - taiga-events

volumes:
  taiga-static-data:
  taiga-media-data:
  taiga-db-data:
  taiga-async-rabbitmq-data:
  taiga-events-rabbitmq-data:


networks:
  taiga:
    name: taiga

.env:

# Taiga's URLs - Variables to define where Taiga should be served
TAIGA_SCHEME=https  # serve Taiga using "http" or "https" (secured) connection
TAIGA_DOMAIN=taiga.unprism.ru  # Taiga's base URL
SUBPATH="" # it'll be appended to the TAIGA_DOMAIN (use either "" or a "/subpath")
WEBSOCKETS_SCHEME=wss  # events connection protocol (use either "ws" or "wss")

# Taiga's Secret Key - Variable to provide cryptographic signing
SECRET_KEY="secret"  # Please, change it to an unpredictable value!!

# Taiga's Database settings - Variables to create the Taiga database and connect to it
POSTGRES_USER=taiga  # user to connect to PostgreSQL
POSTGRES_PASSWORD=taiga  # database user's password

# Taiga's SMTP settings - Variables to send Taiga's emails to the users
<some email data>

# Taiga's RabbitMQ settings - Variables to leave messages for the realtime and asynchronous events
RABBITMQ_USER=taiga  # user to connect to RabbitMQ
RABBITMQ_PASS=taiga  # RabbitMQ user's password
RABBITMQ_VHOST=taiga  # RabbitMQ container name
RABBITMQ_ERLANG_COOKIE=secret-erlang-cookie  # unique value shared by any connected instance of RabbitMQ

# Taiga's Attachments - Variable to define how long the attachments will be accesible
ATTACHMENTS_MAX_AGE=360  # token expiration date (in seconds)

# Taiga's Telemetry - Variable to enable or disable the anonymous telemetry
ENABLE_TELEMETRY=True

Desktop (please complete the following information):

• OS: Ubuntu 22.04
• Browser: Chrome
• Version: lastest