Want to remove GA and install GTM. But the GA still fires/tracking

Hi,

We have been using GA code for many years. We want to install the GTM code and remove all GA code. We replaced it with the GTM code. But still the site is firing GA code. The Analytics still shows live data too. So it means the site is being injected with GA code. I have tried to isolate all other plugins and theme customizations. The only thing I did not touch was the RankMath. The GA code is still firing/tracking. So how can I remove the site being injected with GA code? Is it going to help if I de-authorize Search Console with our Google Account?

Thank you for the help in advance.

Dani Gorgon