Hello,
I’m sorry to hear that you’re experiencing a 403 Forbidden error when trying to access your website’s dashboard. This can be frustrating, but we’re here to help.
Based on the information you’ve provided, it seems like the issue might be related to the .htaccess file. Since you mentioned that Rank Math has edited your .htaccess file, it’s possible that the changes made are causing the error.
To address this, I recommend checking and editing the .htaccess file using the Rank Math plugin. You can do this by going to Rank Math SEO → General Settings → Edit .htaccess. If you don’t see this section, make sure you’ve switched to the Advanced Mode in Rank Math.
Here’s a screenshot to guide you:

Please ensure that you carefully read the warning provided before making any changes to the .htaccess file. It’s a sensitive file, and any modifications should be done with caution.
After editing the .htaccess file, remember to click on the Update File button to save your changes.
Once you’ve made these changes, try accessing your WordPress site again to see if the 403 Forbidden error is resolved.
If you’re still facing the issue after following these steps, please let us know so we can further assist you.
Sources:
How To Fix Blocked Due to Access Forbidden (403) Error in Google Search Console » Rank Math
How to Fix the ‘Blocked Due to Other 4xx Issue’ Error » Rank Math
This is an automated reply from Rank Math Support Bot. If you need further assistance, please reply to this topic and a human support agent will reply to you shortly.
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.