I personally had this issue, and I know of many others that have it aswell.
Well here’s a fix for you!
When you get the error after you launch RedM,
Put your details in the sign in page on the Rockstar Launcher,
When it takes you to the 2FA verification code menu, ignore it and click the yellow highlighted “visit the support page”.
Once you’re on this, go to the top right, click “SIGN IN”
Now here you want to put in your details, click “stay signed in” and do all the 2FA stuff.
Once you’re logged in, relaunch RedM, and you shouldn’t have this issue anymore!
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