Hello,
We apologize for the issue you are facing with the redirections not saving. This can happen if some of your database tables are missing. To resolve this, please follow these steps:
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Navigate to Rank Math SEO → Status & Tools → Database Tools from your WordPress dashboard.

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If the Database Tools option is unavailable, enable Advanced Mode at the top-right area of the screen.
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Click on Re-create Missing Database Tables.

This should help in creating any missing tables and allow your redirections to save properly again.
If you continue to experience issues, please reply to this ticket with the error log message you mentioned, and a human agent from our support team will assist you further.
Thank you for raising this concern!
Sources:
Solving Redirection Issues Using Rank Math SEO Plugin » Rank Math
I tried all your recommendations. Have you a solution? TKS
Nothing to me? Have you a solution? TKS
Hello,
Thank you for contacting us and sorry for any inconvenience that might have been caused due to that.
This error usually happens when you try to save some incorrect redirection. In this case, can you please share the redirection you’re trying to create on your website in this structure?
Source:
Redirection Type:
Destination URL:
Or, you can share a screenshot of the redirection by using a tool like https://imgur.com/upload so that we can check this further for you.
Looking forward to helping you.
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.