Hello
I´m running php 7.4 and some week ago the server start throwing this error in wp-error-log:
PHP Parse error: syntax error, unexpected 'static' (T_STATIC) in /var/www/html/wp-content/plugins/advanced-access-manager/vendor/vectorface/whip/src/Whip.php on line 124
The error seems to be related to old php, this error is thrown if you don´t have php8.0 or later.
You state that the plugin should work on 5.6 and later, but I guess this may be old news?

I installed v7.0.4 and this worked.