It is not possible to log in to WordPress Admin Dashboard via the “Log in” button in Plesk WP Toolkit: Retrieving WordPress admin credentials, please wait

Symptoms

• On attempt to log in to WordPress Admin Dashboard via the "Log in" button in Plesk WP Toolkit, the operation fails with one of the following error messages:

  PHP Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 20480 bytes) in /var/www/vhosts/example.com/httpdocs/wp-content/plugins/<plugin_name>/vendor/composer/autoload_static.php on line

• In some cases, a new tab is opened in a web-browser where the following message is displayed and nothing else happens:

  Retrieving WordPress admin credentials, please wait

Cause

The domain's PHP memory limit is insufficient

Resolution

Increase PHP memory_limit for the domain:

1. Log in to Plesk.

2. Go to Domains > example.com > PHP.

3. Increase the memory_limit value (for example, to 256M).

4. Apply the changes.