Error while attempting to enable push notifications

In Setup > Options > User alerts and notifications enabling push notifications throw the following error:

Code:

RuntimeException: Unable to create the key in src\vendor\web-token\jwt-core\Util\ECKey.php at line 160
Jose\Component\Core\Util\ECKey::createECKeyUsingOpenSSL() in src\vendor\web-token\jwt-core\Util\ECKey.php at line 119
Jose\Component\Core\Util\ECKey::createECKey() in src\vendor\web-token\jwt-key-mgmt\JWKFactory.php at line 78
Jose\Component\KeyManagement\JWKFactory::createECKey()...

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