Hello,
We apologize for the issue you are facing with accessing your website’s admin dashboard after the Rank Math update. The 403 access denied error can occur due to various reasons, including administrative rules or permission settings.
Here are some steps you can take to troubleshoot this issue:
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Check User Roles and Capabilities: Ensure that your user role has the necessary capabilities to access the admin dashboard. You can check this in the Role Manager settings within Rank Math. If you have access, make sure your user role is granted all required capabilities and click the Update Capabilities button to save changes.

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Multisite Environment: If you are using a multisite setup, ensure that Rank Math is installed correctly across the network. Only the Super Admin can install plugins network-wide, so verify that it has been activated properly.
For more details, you can refer to our tutorial on installing Rank Math in a multisite environment.
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Site Health Check: Consider using the Site Health Check plugin to identify any common issues that might be causing the 403 error. You can install it by going to the Plugins page, clicking on “Add New,” and searching for "Health Check & Troubleshooting". After installation, activate it and check for any reported issues.

If these steps do not resolve the issue, please reply to this ticket with your site URL, and a human agent from our support team will assist you further. Thank you for raising this concern!
Sources:
Sorry, You Are Not Allowed to Access This Page » 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.