These aren't cracked accounts. I purchased in my local online store, and share the login details here.
Those sellers literally paid for Grammarly Premium and own the accounts. It's a win-win situation where the seller earns money & we can enjoy the premium at cheap prices. I personally wanted to provide more value to others, and that's why I'm sharing it out.
• If the error says: "Sign-in is disabled because of too many attempts. Try again later."
Method 1: Wait for a few hours and try again.
Method 2: Clear Grammarly cookies, try restarting your pc then enter with the new login detail.
• If the error says: "Your password is incorrect or this account doesn’t exist."
Then the account is not working anymore.
If it's not working, kindly please state which error cases did you encounter (which I've written on the spoiler post above). So that I can reach out to the seller.