"search_engine=v2 is not available for your tenant because it is deprecated" error

[mufid]

Description

I've configured WP-Auth0. But then after trying to login, it says:

There was a problem with your log in:
{\"statusCode\":400,\"error\":\"Bad Request\",
\"message\":\"The User Search Engine v2 
(search_engine=v2) is not available for your tenant 
because it is deprecated. Please use the 
User Search Engine v3 instead (search_engine=v3).
For guidance on how to upgrade from v2 to v3, see
https://auth0.com/docs/users/search/v3#migrate-from-search-engine-v2-to-v3\",
\"errorCode\":\"operation_not_supported\"}
[error code: access_denied]

Prerequisites

• Did you check the documentation? Yes, it only says API for migration for standard web app, but says nothing about this wordpress plugin
• Did you check the Auth0 Community? Yes. Found this link, it says something about user API, but not sure if this is relevant
• Did you check the WP.org Support Forum? Yes
• Are there any related or duplicate Issues or PRs in this repo? No duplicate

Environment

Please provide the following:

• WP-Auth0 version: 3.7.0
• WordPress version: 4.9.8
• PHP version: PHP 5.6.33-3+ubuntu16.04.1+deb.sury.org+1 (cli)
• Browser version, if applicable: Firefox 62.0.3 (64-bit)

Reproduction

1. Create new tenant with Auth0
2. Implement Wordpress by creating new Application, as in Auth0 official guide
3. Trying logging in with Auth0

Expectation: can login as usual
Actual: It shows search_engine=v2 is not available for your tenant because it is deprecated

[cocojoe]

Thanks for the feedback, we will look into this.

[joshcanhelp]

@mufid - Thank you for the report here and apologies for the trouble. The fix here is:

1. Go to your Auth0 dashboard > Rules
2. Edit the Account-Linking-Do-Not-Rename Rule:

3. On or around line 26, change v2 to v3

I'll put out a patch release to address other new installs.

[joshcanhelp]

Releasing the patch on WP.org now.