Composer install of 2.2.0 fails on Drupal 10.0.5 w/o prior MailChimp

Ran into the same thing. Run

composer require thinkshout/mailchimp-api-php:^3.0.0-rc4

First then install with

composer require 'drupal/mailchimp:^2.2'

Success!

Stuck with the same problem as the author, but while updating Mailchimp 2.0.2 module to 2.2. on Drupal 9.5.7. Trying to update "mailchimp API" first, as suggested by the @schiavone but getting a slightly different error:

composer require thinkshout/mailchimp-api-php:^3.0.0-rc4

Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Root composer.json requires thinkshout/mailchimp-api-php ^3.0.0-rc4, found thinkshout/mailchimp-api-php[3.0.0-rc4] but these were not loaded, likely because it conflicts with another require.
  Problem 2
    - drupal/mailchimp is locked to version 2.0.2 and an update of this package was not requested.
    - drupal/mailchimp 2.0.2 requires thinkshout/mailchimp-api-php ^2.0 -> found thinkshout/mailchimp-api-php[2.0.0, ..., v2.1.3] but it conflicts with your root composer.json require (^3.0.0-rc4).

Any ideas on how to solve this?

I'm getting:

The website encountered an unexpected error. Please try again later.
Error: Class "\Mailchimp\Mailchimp" not found in Drupal\mailchimp\ClientFactory->createInstance() (line 154 of modules/contrib/mailchimp/src/ClientFactory.php).

While trying a fresh install on 9.5.7, using Composer

I believe the latest release should resolve your issue. I was able to install without issue on a fresh d10 site install. If you still have a problem, can you provide steps to reproduce?

I had same as #4 on old install, i had thinkshout in composer.

Did

composer remove thinkshout/mailchimp-api-php

Then

composer require 'drupal/mailchimp:^2.2' -W

Automatically closed - issue fixed for 2 weeks with no activity.

Confirming successful update to the latest version of Mailchimp 2.2.2 on Drupal 9.5.9