Hello,
Yes, our plugin Rank Math is compatible with PHP 7.2
If you are unable to access your WP Dashboard perhaps it is due to a server configuration.
Try contacting your hosting provider and show them that error, they might be able to tell you more about that issue. They can also disable plugins for you to see if it is a plugin conflict.
If you need us to take a closer look leave us your FTP and WP admin access in sensitive data field.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.