Hello,
We apologize for the issue you are facing. Since you have already verified your website using the TXT record method in Google Search Console, you can still set up Rank Math Webmaster Tools by following these steps:
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Open Rank Math Settings: Go to your WordPress Dashboard and navigate to Rank Math SEO → General Settings → Webmaster Tools.
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Select HTML Tag Verification Method: Since you are looking for the HTML code, you can use the HTML tag verification method. In the Webmaster Tools settings, click on HTML tag to generate the verification code.

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Copy the HTML Tag: Click Copy to copy the HTML tag that appears.

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Paste in Rank Math: Paste the copied code into the Google Search Console field in the Rank Math settings.

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Save Changes: Scroll down and click Save Changes to apply the settings.

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Verify in Google Search Console: Finally, head back to Google Search Console and click Verify to ensure that everything is set up correctly.

If you encounter any issues during this process, please clear your website’s cache and try verifying again. Thank you for raising this concern, and we hope this helps you set up Rank Math Webmaster Tools successfully!
Sources:
How to Verify Your Website on Google » Rank Math
How can I get an HTML tag now?
How can I get an HTML tag now? Should I add property again ?
Hello,
If you have already verified your website in your Google Search Console via TXT records, then you can skip or leave the Webmaster tools option in Rank Math.
The Webmaster tools option is for websites that haven’t been verified yet.
Looking forward to helping you.
Thank you so much for your help.
Hello,
We are super happy that we have addressed your concern. If you have any other questions in the future, know that we are here to help you.
If you don’t mind us asking, could you please leave us a review (if you haven’t already) on
https://wordpress.org/support/plugin/seo-by-rank-math/reviews/#new-post
about your overall experience with Rank Math? We appreciate your time and patience.
If you do have another question in the future, please feel free to create a new forum topic, and it will be our pleasure to assist you again.
Thank you.