Why doesn't AuthGuard work in nest(fastify) + Graphql + jwt?

Question

JSON Web Token

user.guard.ts

import { Injectable, ExecutionContext } from '@nestjs/common';
import { GqlExecutionContext } from '@nestjs/graphql';
import { AuthGuard } from '@nestjs/passport';

@Injectable()
export class GqlAuthGuard extends AuthGuard('jwt') {
  getRequest(context: ExecutionContext) {
    const ctx = GqlExecutionContext.create(context);
    return ctx.getContext().req;
  }
}

jwt.strategy.ts

import { ExtractJwt, Strategy } from 'passport-jwt';
import { PassportStrategy } from '@nestjs/passport';
import { Injectable } from '@nestjs/common';

@Injectable()
export class JwtStrategy extends PassportStrategy(Strategy) {
  constructor() {
    super({
      jwtFromRequest: ExtractJwt.fromAuthHeaderAsBearerToken(),
      ignoreExpiration: false,
      secretOrKey: 'reallyfuckinghard',
    });
  }

  async validate(payload: any) {
    const { _id, email } = payload;
    return { _id, email };
  }
}

decorator

import { createParamDecorator, ExecutionContext } from '@nestjs/common';
import { GqlExecutionContext } from '@nestjs/graphql';

export const CurrentUser = createParamDecorator(
  (data: unknown, context: ExecutionContext) => {
    console.log(GqlExecutionContext.create(context).getContext().req.user);
    const { _id, email } =
      GqlExecutionContext.create(context).getContext().req.user;
    return {
      _id,
      email,
    };
  },
);

resolver

@Query(() => [User])
  @UseGuards(GqlAuthGuard)
  async findAllUsers() {
    try {
      return await this.userService.findAll();
    } catch (error) {
      console.error(error);
    }
  }

Any protected GqlAuthGuard always returns UNAUTHENTICATED, why is that?