import { FusionAuthClient, UserRequest } from '@fusionauth/typescript-client'
...
export class FusionAuthService {
    private fusionAuthClient: FusionAuthClient;

    constructor(private context: Context) {
        this.fusionAuthClient = new FusionAuthClient(context.config.fusionAuth.apiKey, context.config.fusionAuth.apiUrl);
    }

...
    public async updateUser(userId: string, userRequest: UserRequest ) {
        return this.fusionAuthClient.updateUser(userId, userRequest)
            .then(clientResponse => {
                logger.info("User:", JSON.stringify(clientResponse.response.user, null, 2));
            }).catch(logger.error);
    }

here is invocation of updateUser method that happens on 'user.registration.create' event

        if (user) {
            const patchBody = {
                user: {
                    email: event.user.email,
                    data: {
                        userId: user.id
                    }
                },
            }
            await this.fusionAuthService.updateUser(event.user.id, patchBody);
        }

Now I understand that I use updateUser method and I don't know what kind of HTTP request it used.
I have found patchUser and with it get success.

Thanks for your help.

Can you share your code that makes the update? Can you try allowing all the HTTP methods for the key on the /api/user endpoint, not just GET and PATCH?