Critical error: An error of type E_ERROR was caused in line 467

Hello team,
I encounter this critical error error when I create a new key and enter it on furgonetka plugin setting:

When seeking help with this issue, you may be asked for some of the
following information:
WordPress version 5.8.1
Current theme: Fennik Child (version 1.0.0)
Current plugin: Furgonetka.pl (version 1.0.9)
PHP version 8.0.8

Error Details
=============
An error of type E_ERROR was caused in line 467 of the file
/home/sites/15a/0/0c3ce646e6/staging_html/wp-content/plugins/furgonetka/admin/class-furgonetka-admin.php.
Error message: Uncaught SoapFault exception: [HTTP] Error Fetching
http headers in
/home/sites/15a/0/0c3ce646e6/staging_html/wp-content/plugins/furgonetka/admin/class-furgonetka-admin.php:467
Stack trace:
#0 [internal function]: SoapClient->__doRequest(‘

Could you please assist? I tried with safari, chrome and FF.

Kind regards,
Ludovic V.